Added missing template tests and checked existing ones (II)

Covers lbaas_agent.ini.erb, metadata_agent.ini.erb, neutron.conf.erb,
neutron-server.erb, neutron.sysconfig.erb and rootwrap.conf.erb
Change-Id: Ie5c1bf67f57f4db554ba341d02732061a1f2c97c
Partial-Bug: #1328999
Implements: blueprint add-template-tests
Merge "Added missing template tests and checked existing ones (II)"