Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 62f7418c1ceee4dd213eb04d63d3bafecb9d0a72
  - Bump pnfsimulator to 4.0.0-SNAPSHOT
    
    Change-Id: I955e2befdcb95a2b50fa3c3ba0d5a734d85fd753
    Issue-ID: INT-821
    Signed-off-by: Marcin Migdal <marcin.migdal@nokia.com>
    Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
    
diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index 62163be..62f7418 160000
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit 62163beebaa5fc9742eff6ca6262b9d04743a28a
+Subproject commit 62f7418c1ceee4dd213eb04d63d3bafecb9d0a72