Update git submodules

Update git submodules

* Update docs/submodules/dovetail from branch 'stable/fraser'
  - Add a patch to make ram_num configurable for DPDK

    1. add a patch to change bottlenecks source code within git repo
       /home/opnfv/bottlenecks
    2. add a script to run the patch within Bottlenecks git repo
    3. copy the edited file yardstick.py to /usr/local/lib
    4. change the results dir from /home/opnfv/bottlenecks/results to
       /home/opnfv/results which is out of Bottlenecks git repo

    JIRA: BOTTLENECKS-248

    Change-Id: I86ff51ec41caf79fb16e0985db8eefa679153102
    Signed-off-by: xudan <xudan16@huawei.com>