Update git submodules
Update git submodules

* Update plugins/plugin-manager from branch 'master'
  to 9edc1950d3c0a3717cefda1688a4c37e7fc652fb
  - GerritVersionBranch: Fix branch detection for 3.0.0-rcx versions
    
    The detection assumes that any version string that includes "-" in
    the 'minor' version is a git describe generated version, such as:
    
      2.16.8-17-gc8b633d5ce
    
    and treats it as the 'next' version. This logic does not take into
    account that the latest release version 3.0.0 has the explicit trailing
    ".0" on it, so the version "3.0.0-rc3" is parsed incorrectly and "master"
    is returned.
    
    Change the condition to check for "-g" instead, since "g" is always
    included before the abbreviated sha1 in a git describe version.
    
    Add tests to confirm that it behaves as expected for various forms
    of version string.
    
    Change-Id: Ifab49a4d3985acce0dbdcbe54d89460bd7c3f027
    
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