Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 7981396ba705aa2d22ecf680f74a462d784c5e56
  - Merge "Moved setNeutronNetworkId() call inside null check to prevent crash at outputs.get() call"
  - Moved setNeutronNetworkId() call inside null check
    to prevent crash at outputs.get() call

    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: I51ad7a6de93c88ce6743234b943f9abcbc065a70

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 6a997ad..7981396 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 6a997ad7a4f3670387b19d989986047cc15c51e3
+Subproject commit 7981396ba705aa2d22ecf680f74a462d784c5e56