WIP: Add the capability to set the realm
Added the capability to set the realm configuration parameter.
Realms are authentication user groups that can be defined to give different access rights to the network.
The commit modifies the fortisslvpn-dialog to include a text field for explicitly setting the realm. The realm field needs to be included in the config file, and checked for validity. Then, it has to be passed on to openfortivpn in the command line arguments with the --realm key. In addition, a new key has to be defined in nm-service-defines.h