Update git submodules

Update git submodules

* Update docs/submodules/doctor from branch 'master'
  - Merge "Add doctor-test package"
  - Add doctor-test package

    It also updates test-requirements.txt to conform with OpenStack
    stable/ocata and renames it requirements.txt.

    tests.main:main is considered as entry point and run.sh as script.
    run.sh could be renamed to avoid possible conflicts in functest.

    tox.ini is updated to pin the right versions and build files are
    filtered.

    The next dependencies can be safely removed:
      - paramiko
      - scp
      - python-openstackclient
      - python-ceilometerclient
      - virtualenv

    Change-Id: I2091cfe4751640bf83d77e1fdd713af1e31fa89d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>