Update git submodules

* Update docs/submodules/msb/apigateway.git from branch 'master'
  to 719802fea6fc36c91a4d142314a8521193eba871
  - Migrate msb-apigateway docs

    Merging this will create
    https://onap-msb-apigateway.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: I8a80ccef0c4c6947d67e4dea3533fbebda2acc3f

diff --git a/docs/submodules/msb/apigateway.git b/docs/submodules/msb/apigateway.git
index 02d4a70..719802f 160000 (submodule)
--- a/docs/submodules/msb/apigateway.git
+++ b/docs/submodules/msb/apigateway.git
@@ -1 +1 @@
-Subproject commit 02d4a703019249bc0bdee90661928af991a9cadf
+Subproject commit 719802fea6fc36c91a4d142314a8521193eba871