Synchronize configuration files for Icehouse

Worth mentioning:

 - we set router_delete_namespaces in l3_agent.ini to True for SUSE.
   After reading https://bugs.launchpad.net/neutron/+bug/1052535, what
   matters is that iproute2 must have this patch:
   https://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=58a3e8270fe72f8ed92687d3a3132c2a708582dd
   which is the case on SUSE.

 - many config options in nvp.ini got renamed from nvp_* to nsx_*
This shouldn't stop us from merging this pull request as it's not a regression, bug given the above comments we should  consider dropping this to allow for multiple external networks. I'll create a trello card for this as I am not sure yet which side effects this might have.