Update git submodules

Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "teststeps: Improvements of step driven TC"
  - teststeps: Improvements of step driven TC

    This patch adds support of access to VMs deployed automatically
    by deployment scenario (e.g. pvp, pvvp4, etc.). It also modifies
    filter for checking output of executed commands to correctly
    handle different end of line encodings (i.e. \n vs. \n\r).

    JIRA: VSPERF-539

    Change-Id: Ifc796d992b90e316bad5853aaefce79e439e294d
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Al Morton <acmorton@att.com>
    Reviewed-by: Christian Trautman <ctrautma@redhat.com>
    Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
    Reviewed-by: Trevor Cooper <trevor.cooper@intel.com>