Update git submodules

* Update docs/submodules/multicloud/framework.git from branch 'master'
  to 76cb15908ebfab78034aff381ba5c867b5491c05
  - add support to generate docker image for artifactbroker

    . add Dockerfile to describe the docker image steps
    . add build_image.sh to wrap the generation of image
    . Use Alpine as base docker image in distribution to make
      it small

    Change-Id: I8a2c8321be176d549063e6ab296adcacb46b9ad3
    Issue-ID: MULTICLOUD-548
    Signed-off-by: liboNet <libo.zhu@intel.com>

diff --git a/docs/submodules/multicloud/framework.git b/docs/submodules/multicloud/framework.git
index ab387d8..76cb159 160000 (submodule)
--- a/docs/submodules/multicloud/framework.git
+++ b/docs/submodules/multicloud/framework.git
@@ -1 +1 @@
-Subproject commit ab387d808a47eec557e7c162c44fe1e412a2456f
+Subproject commit 76cb15908ebfab78034aff381ba5c867b5491c05