Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 2c5f88c80cd62d58cdb5954d15320ca5180b3637
  - Merge "update so to use most recent update of logging"
  - update so to use most recent update of logging

    Updated pom to use 1.5.1-SNAPSHOT for logging-analytics
    Updated pom while fixing branching issues
    Updated version for logging-slf4j in pom
    Updated to use release 1.6.1 of logging library

    Issue-ID: SO-2493
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I79c543c283eeda0a6eb008535ba4488433fbb0ae