Add API functions iof:forward_mod_with_push_vlan/{4,5} to icontrol app

These functions allow to crate a flow that forward packets between the
ports and add VLAN tag to packets on output.
Merge branch 'master' into push_vlan-api

Conflicts:
	icontrol/README.md
	icontrol/apps/icontrol/src/iof.erl
Merge branch 'push_vlan-api'