Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Clean /etc/rally.conf

    Else rally_sanity may print logs in tempest_smoke res dir.

    Change-Id: Iae97d533e9b99dcf8da70229b0675228472bfe52
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Update restack defcore sync

    It stops depending on refstack_client which cannot work till
    OpenStack Queens.

    JIRA: FUNCTEST-977

    Change-Id: I2340643de82ab10d8fb83fb3a7fbfd1f412b2d7b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>