Update git submodules

* Update docs/submodules/multisite from branch 'stable/danube'
  - Update the Colorado description to Danube

    There is still Colorado description in
    multisite.kingbird.installation.rst, need to update it.

    Change-Id: I9b4b0d4524d12f0a160d31d4f59c60a13f48596b
    Signed-off-by: joehuang <joehuang@huawei.com>
    (cherry picked from commit 22d48a744158d5aafa7e2a999704eb877a77992b)

diff --git a/docs/submodules/multisite b/docs/submodules/multisite
index ad16e76..e58dec8 160000 (submodule)
--- a/docs/submodules/multisite
+++ b/docs/submodules/multisite
@@ -1 +1 @@
-Subproject commit ad16e76bad021425198e77773b0b691a03313b38
+Subproject commit e58dec81b82c98135b57918293d8f9e8f2f1ccc6