Forbid to attach security services with same type to share network

Manila should not allow attach several security services
with same type to a share network, for example, two LDAPs
or two Active Directory services.

Add unit tests and fix tempest tests.

Closes-bug: #1358652

Change-Id: Id37e986e537941fe8f9086b8b150d6073c97d1ed
Merge "Forbid to attach security services with same type to share network"