Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 6cec5272c3887bf998c56c5243f7ee6ee964e3fb
  - Pnfsimulator-docker push configuration
    
    New configuration for pnfsimulator and netconfsimulator added for docker builds.
    Version of maven docker plugin downgraded to 1.0.0
    Single tag added to images
    
    Change-Id: Ia0e38b2c65e943614c7463d7889a7ca0b1aa0517
    Issue-ID: INT-1134
    Signed-off-by: Tomasz Golabek <tomasz.golabek@nokia.com>
    
diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index 8fff4b5..6cec527 160000
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit 8fff4b587d7a19079fa0b2de5ffa31dfb639d7a2
+Subproject commit 6cec5272c3887bf998c56c5243f7ee6ee964e3fb