Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel]reschedule fuel daily job on zte pods"
  - [fuel]reschedule fuel daily job on zte pods

    - delete fuel ci jobs on zte-pod2
    - according to Euphrates scenario fuel supports[1], disable kvm scenario
    on zte-pod3, and enable ovs scenario on zte-pod1.

    [1] https://wiki.opnfv.org/display/SWREL/Euphrates+Scenario+Status

    Change-Id: Ia84e11d52583a477a105a00691e07eb765f1fae3
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>