Update git submodules

Update git submodules

* Update docs/submodules/sdc/sdc-workflow-designer.git from branch 'elalto'
  to ecdc9e7f3c2949b07e7de24c1f065af483f6b347
  - Use versioning, zusammen and session libs from sdc-common-be

    zusammen-lib in sdc-common-be uses cassandra 3.6.0 withoutJMXReporting
    (cassandra 3.4.0 with spring boot 2.1.0 caused:
    java.lang.NoClassDefFoundError: com/codahale/metrics/JmxReporter)

    Bump to version 1.5.2

    Change-Id: I6786b0dfec6c4052ae775fcb478aba4b23cf805f
    Issue-ID: SDC-2541
    Signed-off-by: talig <talig@amdocs.com>