Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 5e18e8dfb30778f1dd2d6bba2644f58c6b8315ec
  - Merge "Add API for commit and abort OrchestrationTask"
  - Add API for commit and abort OrchestrationTask

    Issue-ID: SO-2368

    Add methods for commit and abort an OrchestrationTask

    Change-Id: I4646e00e6aa2e04e0b44ee860906da64c6e162fc
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 3d6d255..5e18e8d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 3d6d255441d913e28639a74c52b057878c6a3b94
+Subproject commit 5e18e8dfb30778f1dd2d6bba2644f58c6b8315ec