Add security service to share networks

This patch adds dynamic security services configurations
when provided in the new manila-tempest-plugin MultiOpt.
With this patch the manila-tempest-plugin will be
able to perform tests using real security services
configurations provided by the administrator in a new
config option called 'security_service'.

Change-Id: I544d415f51cd9fa9daae0010dd9d9c5d0dde516b
Closes-Bug: #1699856
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
6 files changed