Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to bf8459dc1b06f4a1f7e36e30fbe32136ab9c5a25
  - Merge "Migrate so docs"
  - Migrate so docs

    Merging this will create
    https://onap-so.readthedocs.io
    This build will run in parallel
    to the current docs generation method
    until we are ready to cut over.

    Issue-ID: CIMAN-364
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: I447112810fed1392d928ed50e7551cf9ff48fbdb

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 400eac6..bf8459d 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 400eac6792f0c41d30bef8d118be51a801652b2c
+Subproject commit bf8459dc1b06f4a1f7e36e30fbe32136ab9c5a25