Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 1f15ae1d352cdef1dc14d7d6fa36e70b701b0e91
  - Merge "Removed MsoLogger 'mso-requests-db-repositories'"
  - Removed MsoLogger 'mso-requests-db-repositories'

    Removed MsoLogger from adapters ('mso-requests-db-repositories')
    Replaced MsoLogger with plain slf4j.
    Refactored login output.
    Fixed imports.

    Change-Id: Ibdd89620e6d23550fe523727475f1cd1e95d3992
    Issue-ID: LOG-631
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>

diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index d9d72da..1f15ae1 160000 (submodule)
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit d9d72dae9cfc1011aa5cf3326e09aa219e50b462
+Subproject commit 1f15ae1d352cdef1dc14d7d6fa36e70b701b0e91