Update git submodules

Update git submodules

* Update manila-specs from branch 'master'
  to c0fbe3f61ce7e80166193e8db8651c24afb7e9d8
  - Merge "Drop basepython"
  - Drop basepython

    This was required to support env with both python 2 and 3 are available
    but is no longer needed now since python 2 was retired long time ago.

    Also drop the VIRTUAL_ENV environment which is now automatically set
    by tox.

    Change-Id: I1468baa8dce5383781a1affeafb09495053557e9
    Co-authored-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
    Signed-off-by: Ivan Anfimov <lazekteam@gmail.com>