Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "llc-management: Support for LLC management with RMD"
  - llc-management: Support for LLC management with RMD

    This patch adds support for LLC-Last level cache
    management using RMD. The changes include:
    1. 08_llcmanagement.conf: The configuration file to define cache
    allocation policy.
    2. testcase.py: To trigger llc-allocation and cleanup before and
    after the test, respectively.
    3. llc_management/rmd.py: The main file the performs the llc
    allocation and cleanup.
    4. llc_management/resthttp.py: Generic utility to call rest APIs,
    with http.
    5. Fixed a build error due to change in name mismatch.
    6. Fixed pylint errors. Override built-in function error.
    7. Added empty __init__.py to avoid import errors
    8. Fixed deprecated functions errors
    9. Fixed copyright issues, removed python-3 checking.
    10. Removed pylint disables.
    11. resthttp.py is already part of stcrestclient used in
    tools/pkt_gen/testcenter/ scripts. Hence, deleted from the source.
    12. Year update from the license
    13. Fixed some testcases.py collision issue

    JIRA: VSPERF-544

    Change-Id: I7cbd155dd66f5a0cef544751841e71b95c9b6821
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index 52c154c..a897b7b 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 52c154c463705b51c54d639026093ecd80c9a6b4
+Subproject commit a897b7bdc10e20db989d10ff7cdf8a14b5a5d517