Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Install new neutron-tempest-plugin

    Change-Id: Id43e7cd5efa4a78397238bf27ef7e6b476704557
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Remove duplicated installation

    Change-Id: Ib6d969460e6674ec892b7d657b184c2dcf614ea0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Disable refstack_defcore due to testr

    refstack_client is hardcoded to testr when normalizing tests list.
    It's disabled till refstack_client conforms with OpenStack Queens
    (.testr.conf was removed from tempest).

    Change-Id: I10c7059e049017db994003eb5d42da83e1d5a839
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Disable volume in Patrole 0.3 by default

    Else it fails without /etc/cinder/policy.json.

    Change-Id: Iaa5fb5b42626f2fbe00c3a89fa3edf4eae4ac166
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 1137642..c97b870 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 11376429e4a807790da32ea9b9eaf4856530baee
+Subproject commit c97b870f9875a7b09bf0fdb059b24f963da2e4c2