Update git submodules

Update git submodules

* Update upstream/vswitchperf from branch 'stable/colorado'
  - docs: Update links for Colorado 2.0

    References among VSPERF documents are realized by html links
    to the final doc version stored inside the artifactory.
    These links are release specific and have to be updated
    for every new release or release version. This patch
    prepares links for Colorado 2.0 release.

    JIRA: VSPERF-415

    Change-Id: Ibd17d55063069204a5556058e51660b542c8bee4
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
    Reviewed-by: Al Morton <acmorton@att.com>
    Reviewed-by: Christian Trautman <ctrautma@redhat.com>
    Reviewed-by: Bill Michalowski <bmichalo@redhat.com>