Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to 7dbcc20e9ffa3aa72365221cbfb47a8b93d61c2a
  - lowered code smells

    Removed some unused imports

    Issue-ID: APPC-1859
    Change-Id: Ida19cc613baf2a8d95c6b0f3e91e7a739fa322fe
    Signed-off-by: Rupinder<rupinsi1@in.ibm.com>
  - removed code smells

    Removed unused imports

    Issue-ID: APPC-1859
    Change-Id: I43556cc2ef71b6adef3f62f7ab229592a5db2a7d
    Signed-off-by: Rupinder<rupinsi1@in.ibm.com>
  - Lowered code smells

    Removed unused imports

    Issue-ID: APPC-1859
    Change-Id: Idcd49f4b9c0ee28ec46ccbb298d957c656900ad8
    Signed-off-by: Rupinder<rupinsi1@in.ibm.com>

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index 305e258..7dbcc20 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit 305e258130ff632bdaf4e5d2e44e2bc05d3d88be
+Subproject commit 7dbcc20e9ffa3aa72365221cbfb47a8b93d61c2a