Update git submodules
Update git submodules

* Update plugins/replication from branch 'stable-2.15'
  to b8d43b446624627b7367347d828012bc1b16c4d8
  - GerritSshApi: strip 'gerrit+' instead of leaving only it
    
    [2018-04-12 22:30:04,038] [ReplicateTo-bitbucket-1] ERROR com.googlesource.gerrit.plugins.replication.GerritSshApi : Error creating remote repository at gerrit+ssh://gerrit-bitbucket@localhost/:
    Exception: org.eclipse.jgit.errors.TransportException: gerrit+: host must not be null.
    Command: gerrit create-project --branch refs/heads/master repo/test
    Output:
    org.eclipse.jgit.errors.TransportException: gerrit+: host must not be null.
    
    Change-Id: Ib53258625b3677f621d2e7e9d6df4b04a94a921d
    Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
    
qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit