Update git submodules

* Update docs/submodules/opera from branch 'master'
  - Updated Ellis configuration

    1. Fix the Ellis port inaccessible issue
    2. Force to pull the latest juju server code

    Change-Id: I8b36271e37e19d3ebab03a9808f11d210f975d59
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/opera b/docs/submodules/opera
index a634642..654e208 160000 (submodule)
--- a/docs/submodules/opera
+++ b/docs/submodules/opera
@@ -1 +1 @@
-Subproject commit a6346420a0e0d2f4564d8ecc030146cae098a7f4
+Subproject commit 654e20848b723541c17d56cf16518db87e14f7ae