Update JGit to 5.0.1.201806211838-r
Update JGit to 5.0.1.201806211838-r

Fixes:
- 'Respect "unshallow" lines in protocol v2'

Release notes:
https://projects.eclipse.org/projects/technology.jgit/releases/5.0.1/review

Change-Id: I01d8083dc355124bf3809bed2e9f0a954f100c20

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