Update git submodules

* Update docs/submodules/appc.git from branch 'master'
  to fc2018739d072a0287b84ff78c94572bce5aba7c
  - Fix escapeInternalJson method

    The method incorrectly handled cases where the json string contained
    json objects internally. These cases should be handled correctly now.

    Change-Id: I43b40414526bcb6577242ab737097dfb9119e618
    Signed-off-by: Patrick Brady <patrick.brady@att.com>
    Issue-ID: APPC-1576

diff --git a/docs/submodules/appc.git b/docs/submodules/appc.git
index c4cac55..fc20187 160000 (submodule)
--- a/docs/submodules/appc.git
+++ b/docs/submodules/appc.git
@@ -1 +1 @@
-Subproject commit c4cac55b9e72103773330d3a031a21ff79895d51
+Subproject commit fc2018739d072a0287b84ff78c94572bce5aba7c