Update git submodules

* Update docs/submodules/opera from branch 'master'
  - Add scenario description in docs

    Change-Id: Ifc78defa03099c284995108f9d00315bbff2495a
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/opera b/docs/submodules/opera
index 32c1a6e..01ff898 160000 (submodule)
--- a/docs/submodules/opera
+++ b/docs/submodules/opera
@@ -1 +1 @@
-Subproject commit 32c1a6ee6d726d4278869abe718e7fcb61614bc7
+Subproject commit 01ff8987aa2b1439a02712f4bb501c704287309e