[doc] Document VPN connection split routing boolean. JB#45606

The vpnconnection UserRoutes dbus property expects the ProtocolFamily to
be specified, as explained in the documentation:

int ProtocolFamily: Protocol family of the route. Set to 4 if IPv4 and 6
if IPv6 route.

With the current code a GetProperty request will return an integer with
value 4 or 6 as expected. However, when the property is set, it expects
a value of 52 (ASCII char '4') or 54 (ASCII char '6').

This change makes it so that when setting the property, integer values
of 4 or 6 are also accepted without dropping support for '4' and '6'.

Mention that "Properties" property name is to be used for a dict when
multiple properties are to be set using SetProperty.

SetProperties D-Bus method is removed and SetProperty handles the
multiple property dict. Moved and reformatted the documentation to
SetProperty D-Bus method.

Include documentation for the SetProperties in VPN connection API.

Add error PermissionDenied for SetProperty and ClearProperty into VPN
connection API. Add missing NotSupported error for SetProperty into VPN
connection API.

Add description of Connect2() to VPN connection API txt. Connect2() was
introduced in commit 3997c159.

For VPN UserRoutes and ServerRoutes properties, the Netmask
field is the IPv4 netmask (like 255.255.255.0) for IPv4 routes.
For IPv6 routes it is the prefix length (like 64) instead.

Reported by Jaakko Hannikainen.

97c31890 Release 1.22
86373b49 dnsproxy: Check split routing when creating a server
27dba284 gdbus: Add g_dbus_client_set_ready_watch()
8bc2a4e4 dnsproxy: Destroy list using g_list_free_full
a33522de AUTHORS: Mention Maneesh's contributions
5ecc2a1f doc: Add API documentation about WiFi P2P Peer
48d43a84 test: Add method related to P2P services
73f8579a gsupplicant: Fix WPS sync-up error with wpa_supplicant
e5c6a34e session: Set state to disconnected when deactivating a session
ee485f6b service: Use connect reason from the failed service
90334bf8 session: Don't sent disconnects to sessions when updating
9d727fdb session: Disconnect on configuration or session change
dd3492fa session: Allow Session Connect and Disconnect be called multiple times
3b6f9c23 client: Allow Session Connect and Disconnect be called multiple times
e377722c session: Remove session, not service, from session list
2dba9668 session: Do not remove non existing policy routing tables
aae5825e session: Do no create two instances of struct connman_service_info
76cb209b session: Update active sessions only on Session Connect and Disconnect
ddf176a0 nfacct: Remove support for NFACCT
fa4176be session: Remove unused NFACCT rules
32e260c6 session_policy_local: Do not use NULL as key to do a hash table lookup
404c4a40 stats: Use bool type instead integer
47b56b8a session: Update session state only after activation has been tried
3cf2e187 session: Expand '*' to all bearer types
027cbb0f AUTHORS: Mention Andrew's contributions
844286e9 doc: Update connection managment algorithm
4990bf7d test: Add a script to test P2P through wpa_supplicant DBus if
a1d11b73 test: Remove useless supplicant's old DBus interface test script
095a8f73 gdhcp: Refactor renew/rebind method
cd2c5c5b gdbus: Replace g_timeout_add with g_idle_add
c42a5f92 gdbus: Fix incorrect DBusConnection reference counting
72cc0878 gdbus: Fix memory leak
12aad903 ntp: Exponential backoff when timeouting a sent message
eef5afa4 ntp: Support Kiss-of-Death packet
aed46d81 service: Check session policy before autoconnect is run.
0f76471c session: Add session policy autoconnect support
0e8b3391 session: Make session policy global
1f7f9262 session: Assign a service to sessions
d4cadd8f service: Disconnect on when last session is deactivated
52806854 service: Add connect reason to debug out in auto connnect
1a242809 service: Add connect reason to __connman_serice_auto_connect()
afd8f2d7 service: Add connect reason to __connman_service_connect()
88b837e1 session: Mark session active or inactive
470013d0 session: Remove service selection implementation
ec09003e Add Gadget session and weighting support.
1a831b6f AUTHORS: Mention Glenn's and Jonathan's contributions
996cbf10 src: Let systemd unmount remote filesystems before stopping connman
a587af99 src: Add D-Bus autostart configuration file
6ad4048d plugins: Add networking support to gadget plugin.
c09371c7 src: Introduce define for CONNMAN_NETWORK_TYPE_GADGET.
9abdf5f8 plugins: Refactor Gadget into separate plugin and file.
1e4e9652 AUTHORS: Mention Hannu's contributions
30e16a13 ntp: Only accept NTP packets from the defined time server
a29da8cc wispr: Handle wispr redirect properly
23fdeed3 inet: Eliminate misleading error logging
cb88f96c AUTHORS: Mention Philippe's contributions
089e52fb README: Update recommended wpa_supplicant version and web page info
3bb94d4c gdhcp: Factor out DHCP Request sending
bd37ce0f Add REBOOTING state support for dhcp client
289c7fc5 gsupplicant: Rely on wpa_supplicant retry mechanism
9e59cc84 AUTHORS: Mention Alban's contributions
82ad0178 config: add ifb in NetworkInterfaceBlacklist default
63aeaf6b src: Add Eduroam network .config file
0d7ad087 doc: Fix formatting
2ca6fb48 dnsproxy: Enable added DNS servers only for the default service
4f04f75b service: Add helper function for detecting a default service index
7b415b99 test: Add script for setting timezone
fefd1454 client: Add initial completion for config and session commands
bd03493b client: Add support for monitor command completion
12c6a7aa client: Add completion for tether command
f27040c9 client: Add on/off completion support for agent modes
95d42a7c client: Complete only one service or technology where appropriate
bee4ba86 client: Add helper function for ending readline completion
27088b96 client: Remove extra string duplication when completing commands
0f1dee2e client: Export command line word count function

git-subtree-dir: connman
git-subtree-split: 97c31890