Upgrade JGit to 4.4.1.201607150455-r.144-gb67df51
Upgrade JGit to 4.4.1.201607150455-r.144-gb67df51

Follow upstream (gerrit) changes.

Change-Id: I66e8291ce6520a245fdecaadab342baea517676d

GerritCodeReview/plugins_gitiles