Change developermode enabling on top PackageKit-Qt

See merge request mer-core/nemo-qml-plugin-systemsettings!54

[developermode] Refresh package cache before resolving developer mode packages. Contributes to JB#41708

Fix VPN data dirs

See merge request mer-core/nemo-qml-plugin-systemsettings!53

[settings-vpn] When VPN doesn't provide domain create one. Fixes JB#41638

See merge request mer-core/nemo-qml-plugin-systemsettings!52

E.i. do not sort when "autoConnect" changes. In practice this means that
sorting is only applied when a new VPN is created. When connection name
is edited, the VPN is first removed and after created again.

Do not use fixed defaultDomain for VPNs that do not provide
domain. Due this it was it possible to import same VPN configuration multiple
times and alter their settings.

This also introduces a new default domain naming.

[systemsettings-vpn] Disconnect VPN when removed from the model. Fixes JB#41636

See merge request mer-core/nemo-qml-plugin-systemsettings!51

Connect pending disconnect only when disconnecting

See merge request mer-core/nemo-qml-plugin-systemsettings!50

When trying to connect and there is an active connection, disconnection
is requested and after disconnected succussfully the new vpn
connection is established.

Jb40595

See merge request mer-core/nemo-qml-plugin-systemsettings!48

Allow only one active vpn at once

See merge request mer-core/nemo-qml-plugin-systemsettings!49

without -x if you have mounted e.g. sdcard or something to a directory
it counts that into the space which is not right.

[disk] Do not follow to other filesystems. Contributes to JB#40595
Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

[disk] Use QStorageInfo. Contributes to JB#40595
Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

Jb41408

See merge request !47

[about] More locations for serial number. Contributes to JB#41408
Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

[nemo-systemsettings] Change PartitionManager to use Udisks2. Contributes to JB#40936

See merge request !46

[developermode] Remove AccountManager references. Contributes to JB#39097

See merge request !45

Remove references to AccountManager as it is not accessible from
this library. This code was already ifdef'd out; the functionality has
moved elsewhere.

Adapt to udisks2

See merge request !42

[developermode] Remove undefined function. Contributes to JB#39097

See merge request !44

[qml-plugin-systemsettings] Disable developer mode account check for now. Contributes to JB#39097

See merge request !43

Cannot use sailfishaccounts on nemo side. Need to figure out better
ways before getting into release level.

[developermode] Use PackageKit directly to install developer mode packages. Contributes to JB#39097

See merge request !30

[nemo-systemsettings] With Udisks2 external device mounting changes under /run. Contributes to JB#39820

This also cleans up hardcoded "nemo" user name.

The progress is updated by PackageKit per-status, but we want
DeveloperModeSettings to update the progress as a total value
across the whole install/remove operation, not whenever any
progress is updated for any status during the operation.