Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - collector: Support for collectd as one of the collectors.
    
    The changes include:
    1. Configuration in 05_collector.conf. User can specify the
    metrics that are of their interest and also fine tune the same.
    2. collectd_bucky.py: This is derived from python_bucky library.
    Formal approval for reuse is obtained.
    3. collectd.py: This is the main file that receives the samples,
    stores the required ones, plots the values and saves the values in
    a data-file in results folder.
    4. Fixed some pylint errors
    5. Added required libraries to requirements.txt. hashlib is supported by
    default. However, matplotlib and numpy required
    6. added __init__.py to overcome import errors.
    7. Crypto needs pycrypto module
    8. Builtin filter function usage return bad-builtin pylint warning.
    Rewrite to remove filter function.
    9. Added support for reporting the ovs processes statistics.
    10. Import order corrected according to pylint
    11. Fixed copyright issues, removed python-3 checking, enhance to
    include VPP and qemu processes.
    12. Removed pylint disables.
    13. Added documentaion to describe sample information
    14. Added @staticmethod to remove disable-no-self-use.
    15. Fixed year in Copyright.
    16. Updated print_results function to print the process values.
    17. Removed example values form INTELRDT_XKEYS in conf file
    18. Removed use of len(SEQUENCE) in loop and renamed data to pdata to
    avoid name clashes
    19. Fixed issue with requirements.txt
    Note: A separate documentation covering all external tools will be
    provided.
    
    JIRA: VSPERF-505
    
    Change-Id: Ieedcbe7b92e8933263d34df12b1e24be8447b524
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
    

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