Update git submodules

* Update docs/submodules/aai/sparky-be.git from branch 'master'
  to e4eca016023cdb36a0c2d973969b238737dd4751
  - Migrate aai-sparky-be docs

    Merging this will create
    https://onap-aai-sparky-be.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: I99105ed362cf498ca88e989162b3694428923e5b

diff --git a/docs/submodules/aai/sparky-be.git b/docs/submodules/aai/sparky-be.git
index 02b88b9..e4eca01 160000 (submodule)
--- a/docs/submodules/aai/sparky-be.git
+++ b/docs/submodules/aai/sparky-be.git
@@ -1 +1 @@
-Subproject commit 02b88b997fd0671c07f58ef00ac4f3c67b2aa55b
+Subproject commit e4eca016023cdb36a0c2d973969b238737dd4751