Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 7fe31a577a1f3d50a0681be8b4d691aef67eb3ec
  - fix global-jjb migration issue
    
    fix global-jjb migration issue
    - VNFSDK, SO
    
    Issue-ID: SO-1992
    Signed-off-by: sarada prasad sahoo <sarada.prasad.sahoo@huawei.com>
    Change-Id: Idaee5994614a9264e0b0edc57be6e529a343b807
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 15ecb55..7fe31a5 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 15ecb55f2f045e2e185a94b4d4985d2563af8b40
+Subproject commit 7fe31a577a1f3d50a0681be8b4d691aef67eb3ec