Add support for https requests on nova metadata

Adds new config value for accessing nova metadata api with SSL. In case
nova api requires client certificate other config values were added
providing client certificate and client private key.

DocImpact

Closes-bug: #1293587
Change-Id: I782a12eb77553f4369b782071b4ad19efb82e5e2
ofa_neutron_agent: Fix _phys_br_block_untranslated_traffic

Install the flow to the correct bridge.

Closes-Bug: 1301142
Change-Id: I2aa7ffd6bb297837a39cdd00794af100bf9ab407
Add nova_ca_certificates_file option to neutron

Previously, neutron had no way to pass a certificates file to the
novaclient.  This change is to add that ability, similar to the way
you can pass a certificates file to neutronclient in nova.conf via
neturon_ca_certificates_file.

Change-Id: I1a3f85505eb44bee604900301af79d773e1952a3
Closes-Bug: #1309694
Merge "ofa_neutron_agent: Fix _phys_br_block_untranslated_traffic"
Merge "Add support for https requests on nova metadata"
Merge "Add nova_ca_certificates_file option to neutron"