Update git submodules

* Update docs/submodules/sdnc/oam.git from branch 'master'
  to 589bc64347dc1281b43622cfd70ba0bc5f5dca1a
  - Merge "Change log4j2 configuration"
  - Change log4j2 configuration

    Changed log4j2 configuration from using properties files to using
    XML, which seems to work more reliably.

    Change-Id: Ib183a4c48aeb9880eff2121fb8b6c7cf521ae7c9
    Issue-ID: SDNC-1167
    Signed-off-by: Dan Timoney <dtimoney@att.com>

diff --git a/docs/submodules/sdnc/oam.git b/docs/submodules/sdnc/oam.git
index a8398ee..589bc64 160000 (submodule)
--- a/docs/submodules/sdnc/oam.git
+++ b/docs/submodules/sdnc/oam.git
@@ -1 +1 @@
-Subproject commit a8398eef1ac270ab7a145e812856b62171af8b6f
+Subproject commit 589bc64347dc1281b43622cfd70ba0bc5f5dca1a