Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Adding orchestra test cases to orchestra project

    Orchestra introduced 2 VNF test cases:

     * orchestra_openims
     * orchestra_clearwaterims

    In the configuration, the 2 projects are still assigned to functest project
    This patch associate the cases with their real project

    Change-Id: I81f6d6fb473916f0f91a5b3795b3ed433c283fb4
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>
    (cherry picked from commit 2aa38f32b9ea0cb248f25d52f100240b2a002bc6)