Update git submodules

* Update docs/submodules/openflowplugin from branch 'master'
  to 9635ef3004fc2c4b5e5259e822321f690d4aa96c
  - Merge "Add missing iteration synchronisation"
  - Add missing iteration synchronisation

    Synchronised BiMaps need to have their iterations protected by
    explicit synchronisation (see the javadocs); this patch adds a missing
    synchronisation in getExistingKey.

    Change-Id: I4bea65e06aee26cf2d5e6ebae86f3bedd2dd6fc6
    JIRA: OPNFLWPLUG-1013
    Signed-off-by: Stephen Kitt <skitt@redhat.com>

diff --git a/docs/submodules/openflowplugin b/docs/submodules/openflowplugin
index 050324cb8fffbbbe3aadd3ec206d96dad708e6c6..9635ef3004fc2c4b5e5259e822321f690d4aa96c 160000 (submodule)
--- a/docs/submodules/openflowplugin
+++ b/docs/submodules/openflowplugin
@@ -1 +1 @@
-Subproject commit 050324cb8fffbbbe3aadd3ec206d96dad708e6c6
+Subproject commit 9635ef3004fc2c4b5e5259e822321f690d4aa96c