Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 31c596c3b111eb4fca0525e9bfa65243be808ac8
  - Remove orphaned entry for pnfsimulator from Coala config
    
    Change-Id: Ib506dbc82e86ec02f8b1b118c3b9dfcf3209e7c2
    Issue-ID: INT-1517
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
    
diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index cfa48db..31c596c 160000
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit cfa48db5d059b891aa53cb52e512504860863bed
+Subproject commit 31c596c3b111eb4fca0525e9bfa65243be808ac8