Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 1b681e360b8d083104026080c5517f237dc0945a
  - Integration doc for 5g pnp pnf use case
    
    Issue-ID: INT-1333
    
    Signed-off-by: krzysztof kuzmicki <krzysztof.kuzmicki@nokia.com>
    Change-Id: Ic75ae09374ea806ea67526fba624c7a654c0aa10
    
diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index da0d592..1b681e3 160000
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit da0d59289324cd6d604cf1bd9be4ffd709f3f5b4
+Subproject commit 1b681e360b8d083104026080c5517f237dc0945a