[connman] Define iptables function with callback in firewall rules. JB#44071
This commit adds a possibility to set a iptables adding callback function for each firewall rule. The adding callback prototype is the same as __connman_iptables_append() and __connman_iptables_insert() and is defined as connman_iptables_manage_cb_t in connman.h. This is used with general, dynamic and tethering rules. With general rules the rules are appended to the end. With dynamic and tethering rules the rules are inserted on top of the managed chain. The logic behind this is that the general rules can be defined as the base rules and service specific rules override the general rules.
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