Update git submodules

* Update docs/submodules/ccsdk/distribution.git from branch 'master'
  to fc4bb348c8a8b4a5d5f77065b8ebbca16d6ce5b8
  - Update distribution scripts to python3

    Also use python3 packages in Dockerfiles.
    Make python2 also available for OpenDaylight until they migrate

    Signed-off-by: Miroslav Los <miroslav.los@pantheon.tech>
    Issue-ID: CCSDK-1923
    Change-Id: I3d4453ccbfe191c545ba574695387dd33c129e25

diff --git a/docs/submodules/ccsdk/distribution.git b/docs/submodules/ccsdk/distribution.git
index 4ec0326..fc4bb34 160000 (submodule)
--- a/docs/submodules/ccsdk/distribution.git
+++ b/docs/submodules/ccsdk/distribution.git
@@ -1 +1 @@
-Subproject commit 4ec03269604e3bd897207552127f94b4d1f30850
+Subproject commit fc4bb348c8a8b4a5d5f77065b8ebbca16d6ce5b8