Update git submodules

* Update docs/submodules/portal.git from branch 'master'
  to 4b7993a3e61c9afea0674ec6a81fb1bcb13c8189
  - Merge "Fix for NullPointerException in ecomp-portal-BE-common"
  - Fix for NullPointerException in ecomp-portal-BE-common

    A "NullPointerException" could be thrown; "epUser" is nullable here
    Either log or rethrow this exception

    Issue-ID: PORTAL-562
    Change-Id: I11a72534f75efec474f49f8a5cb66affb810348f
    Signed-off-by: Parshad Patel <pars.patel@samsung.com>

diff --git a/docs/submodules/portal.git b/docs/submodules/portal.git
index e7a95ab..4b7993a 160000 (submodule)
--- a/docs/submodules/portal.git
+++ b/docs/submodules/portal.git
@@ -1 +1 @@
-Subproject commit e7a95ab1ad58e02df402c40910f41352562bd92d
+Subproject commit 4b7993a3e61c9afea0674ec6a81fb1bcb13c8189