Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Fix remote command execution in common.utils

    yardstick.common.utils get_port_mac and get_port_ip both raise a
    RuntimeError on positive remote command exit status. This commit fixes
    them to use the error raising mechanism in yardstick.ssh.SSH.

    Additionally, the class AutoConnectSSH class needed an additional
    argument to allow the raising mechanism to work correctly.

    JIRA: YARDSTICK-1240

    Change-Id: Idad125ebbd668cef10a6149eb3e601a437a8d40d
    Signed-off-by: Miikka Koistinen <miikka.koistinen@nokia.com>
  - Cleanup pktgen_dpdk unit tests

    * Improve test execution
    * Use common functionality in setUp()
    * Disable logging
    * Remove tests that test common/utils code. These tests are moved to
      common/utils's unit tests in a follow-up patch.

    JIRA: YARDSTICK-1239

    Change-Id: I88d047fe25c4c13bea446c9fc9bda92306420296
    Signed-off-by: Miikka Koistinen <miikka.koistinen@nokia.com>