Upgrade JGit to 4.6.1.201703071140-r.149-g61f830d3a
Upgrade JGit to 4.6.1.201703071140-r.149-g61f830d3a

This snapshot includes numerous changes since the previous one.

There is currently nothing that we specifically need in this snapshot,
but it brings us closer to what will be in the upcoming 4.7.0 release
and will allow us to potentially catch any issues before release.

Change-Id: I4c3642eab4c1f1128e2e19cf656dee13270662e2

GerritCodeReview/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,gerrit-review/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,gerrit-review/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit