Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Added ext_net_name into template substitution variable."
  - Added ext_net_name into template substitution variable.

    Without the change, the template would always leverage the
    external network name of 'external'.
    Also am now creating a security group for the VM with the
    floating IP so the test will always be able to access.
    Fixed another test that used the same heat template that
    was changed to add in security groups.

    JIRA: SNAPS-206

    Change-Id: I19b09e91a844f88bd473ea25b2bba71ae19b0aa1
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index b878acf..2f3d18f 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit b878acf1ec1132335120277bf03976758e06d86c
+Subproject commit 2f3d18fd64ce0aea7d229493130404e2bf86dab2