[Rev 03] RFR: No need for locking when using TestHostedRepository

[Robin Westberg]

The pull request has been updated with a complete new set of changes (possibly due to a rebase).

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Commits:
 - 275dc4c6: Merge remote-tracking branch 'upstream/master' into avoid_lock
 - 8ae453d0: Use bare repos instead
 - f6c0004c: Recreate if needed
 - c37fb56e: Improve hosted repo init times
 - 16446a6e: No need for locking when using TestHostedRepository

Changes: https://git.openjdk.java.net/skara/pull/219/files
 Webrev: https://webrevs.openjdk.java.net/skara/219/webrev.03
  Stats: 79 lines in 7 files changed: 59 ins; 10 del; 10 mod
  Patch: https://git.openjdk.java.net/skara/pull/219.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/219/head:pull/219

PR: https://git.openjdk.java.net/skara/pull/219