Upgrade JGit to 5.1.2.201810061102-r
Upgrade JGit to 5.1.2.201810061102-r

This JGit release implements validation of .gitmodules files to protect
unguarded tools against CVE-2018-17456.

See https://nvd.nist.gov/vuln/detail/CVE-2018-17456

Change-Id: Ie9b39811adfa09c3c5268ee0d2ea4cd42fb9409a

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