Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Created domain classes for security groups."
  - Created domain classes for security groups.

    Created SecurityGroup and SecurityGroupRule classes so the neutron_utils
    for security groups will be returning objects of these types instead of
    the OpenStack objects returned by the API calls.

    JIRA: SNAPS-116

    Change-Id: I76ed1f85f7d54b984fc6f6ac28cee7680a1109e5
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index b9a8899..2a6d3a0 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit b9a8899d9fd402cb9011ce40f08d6979cee9228a
+Subproject commit 2a6d3a0f73eb58762bdbe10567cfbb6edec54abb