Update git submodules

* Update docs/submodules/vswitchperf from branch 'stable/fraser'
  - Doc: Documentation of Additional tools configuration.

    This patch adds tools.rst under docs/testing/user/configguide.
    tools.rst include documentation of installing and configuring
    Collectors, Loadgens and LLC-Cache Management.
    Changed Interested to Interesting and updated barometer info.

    Change-Id: Id8de4d25619780636d242a04304696f4093b4c07
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
    (cherry picked from commit a9b7e94f1338806cb2503e782b6d7dba76bd9b4b)

  - Doc: Release notes for Fraser

    Added release-notes for Fraser.
    Updated SLES15 related enhancement
    Consolidated and sorted the changes.

    Change-Id: Id6ecea4b3cf3f38aa88c03bc4959b383c944f415
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
    (cherry picked from commit 8ef5b9570a201a8d07dd52e3afbe800a25040b58)

  - Update Java to version 10 for SLE15

    Newwer builds contain version 10 already.
    For version 9, additional tweaks are needed.

    Change-Id: Ic7d55a80ab48fb45113ee0f1ab9aaa797298b87f
    Signed-off-by: Jose Lausuch <jalausuch@suse.com>
    (cherry picked from commit ce4773f7717a8a7029ea284aca6b8afa0e94f385)

  - Add sshpass lib for Suse distros

    This patch completes https://gerrit.opnfv.org/gerrit/#/c/52191

    Change-Id: I35259bdcbdb67237576d7b9b6957266c48f6309f
    Signed-off-by: Jose Lausuch <jalausuch@suse.com>
    (cherry picked from commit a3d6f14ae861ed8320288f5068ca091c4abf0b7a)

  - scapy: Fix scapy import in Xena

    Remove unnecessary scapy import, which is causing pylint error
    with recent pylint version.

    JIRA: VSPERF-566

    Change-Id: I082de0e93242486248beaed6822a8d0f30fff7e5
    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>
    (cherry picked from commit ba486932a77eb7b1ae2f1fd6b3e231df925887e7)

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index 6602980..b3a84a2 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 66029803af7f3d21a0697e3054b7dc3564bc5e7d
+Subproject commit b3a84a29003640fe460e384936225296b723c4d5