Pin neutron gem versions for stable branch

This intends to pin all the major gems to the version they were during
development cycle.  This should isolate the existing tests from changes in
rspec, etc.

Partial-Bug: 1326034
Change-Id: I17ffd9255de6e04d0b036fa9466bf59171b1a762
Isolated network support

This patch aims to enable support for both:
- isolated metadata which enable metadata support on isolated networks.
- metadata networks which allows for serving metadata requests coming
  from a dedicated metadata access network

Conflicts:
	manifests/agents/dhcp.pp
	spec/classes/neutron_agents_dhcp_spec.rb

Change-Id: I0e892c4183bd2bf1910b9b6758c1759475053529
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
(cherry picked from commit 8654569fb4c53f8648578f8485fad80e3fe69e52)
Merge "Isolated network support" into stable/havana