GRE tunnel ipv6.
Integration test for GRETunnel ipv6 and fixed template error.
Fixed errors in parser and commands.
Fix error in test.
Added decription to createTunnel command.
Delete GRE tunnel test ignored, since Mock Resources does not contain GRE configuration.
Test commented since Mock Router does not contain gre information.
Updated wrong comment on command.
CheckParams restriction removed from deleteTunnelAction, since it needs dirty model.
HostedService added to test, so it would pass after implementing dirty model too.
Merge pull request #574 from isartcanyameres/feature/gre-ipv6

Feature/gre ipv6