Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Decrease log level in Energy messages

    Energy could be safely disabled if one env var is missing.
    No error message should be printed in console [1].

    It could be enhanced in a second step to print the reasons (missing
    or incorrect env vars) instead of the full stack.

    [1] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/766/console

    Change-Id: I9c405edae16d186f02c632113de1317c89703991
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>