Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Merge "Update puppet-opendaylight git repo url" into stable/danube
  - Update puppet-opendaylight git repo url

    puppet-opendaylight moved from github to opendaylight.org, updating
    url for git clone.

    JIRA: APEX-455

    Change-Id: I8e4a919d9c8b3dedb62c12135cc1b2741413bc34
    Signed-off-by: Feng Pan <fpan@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 05ab832..adf74f5 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 05ab832380db398a79bbc9b7bc28993175178346
+Subproject commit adf74f577852779302ed77b1d45584af9830c1e2