Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to ef648d52e53e36b735e97dd40788c9e27d90100f
  - [INT-1450] : Documentation of PNF Software Upgrade

    This contains documentation for PNF Software Upgrade
    using Netconf/Yang interface with EM

    Issue-ID: INT-1450
    Signed-off-by: Darragh Egan <darragh.egan@est.tech>
    Change-Id: I8a225b5a4b08de2004ff327148fadfff8976c5de

diff --git a/docs/submodules/integration.git b/docs/submodules/integration.git
index 9148cc2..ef648d5 160000 (submodule)
--- a/docs/submodules/integration.git
+++ b/docs/submodules/integration.git
@@ -1 +1 @@
-Subproject commit 9148cc289f479dd535844c819bdabcf80718305b
+Subproject commit ef648d52e53e36b735e97dd40788c9e27d90100f