The NSXv driver was missing code to do certificate verification.
In fact, it was intentional turned off. This patch adds the
capability to turn it on.
DocImpact:
Two new options for the NSXv driver: ca_file and insecure.
Closes-Bug: #1488265
Conflicts:
vmware_nsx/etc/nsx.ini
vmware_nsx/neutron/plugins/vmware/vshield/common/VcnsApiClient.py
Change-Id: I12ffa2f5e80d4dd357e907631d2bcc76c13a0797