Feature/ip-capability-v6

IP Capability refactored to accept ipv6. The consequence is that the IPv4Capability has been renamed to IpCapability. Some of the differentes are:

- IP capability exports generic method "setIP", which will check if the given IP is v4 or v6.
- Also exports setIPv4 and setIPv6 due to compability.

Karaf command has been adapted to be unique and accepts both versions. Now the argument "ip" and "mask" has been unified in a single argument. 
Example: 192.168.1.1/24, AF:56:C::2/64.

By the other hand, the actionset contains two different actions for ipv4 and ipv6.