Updated git submodules

Project: optf/osdf master ab7a87456538e561d60d209fe534c175ddd0269c

Functest scripts, simulators, and payloads

osdf/adapters/policy/utils.py:
   Removed duplicated code (group_policies and group_policies_gen are very similar,
   and group_policies seems to be not used
osdf/optimizers/placementopt/conductor/api_builder.py:
   changed param name from "grouped_policies" to "flat_policies"
tox.ini
   added starup and shutdown of simulators (flask app with mock payloads) in tox tests
rest all files/changes in "test/" folder
quite a few payload files
Patch set 2: removed a "print()" statement from simulator code

Issue-ID: OPTFRA-22
Change-Id: I0006c577fc459c7c884b55e8316c689afd151780
Signed-off-by: Sastry Isukapalli <sastry@research.att.com>

diff --git a/docs/submodules/optf/osdf.git b/docs/submodules/optf/osdf.git
index ad29f38..ab7a874 160000 (submodule)
--- a/docs/submodules/optf/osdf.git
+++ b/docs/submodules/optf/osdf.git
@@ -1 +1 @@
-Subproject commit ad29f38cbcb164a7f328b26daf789dbff90deb98
+Subproject commit ab7a87456538e561d60d209fe534c175ddd0269c