Update git submodules

* Update docs/submodules/multisite from branch 'master'
  - Revert Change auth_uri in kingbird conf.

    In the present environment auth_uri doesnt contain v3 by default.
    So, revert and add 'v3' in the end.

    Change-Id: I90a0a4e0c5bbcb1365e6f01487ac4214ded019d8
    Signed-off-by: Goutham Pratapa <pratapagoutham@gmail.com>

diff --git a/docs/submodules/multisite b/docs/submodules/multisite
index d77a9e7..8b4eeb5 160000 (submodule)
--- a/docs/submodules/multisite
+++ b/docs/submodules/multisite
@@ -1 +1 @@
-Subproject commit d77a9e76f8814d97b754e0e329e7dafecf6531ac
+Subproject commit 8b4eeb538124f5eedd932caa55bd72fcd6189e81