RFR: 2210: Use authenticatedUrl instead of webUrl in MergeBot

[Zhao Song]

Since the bot uses ssh to clone the repos in MergeBot, the bot should also use authenticatedUrl(ssh url) to access the remote repo. However, the mergeBot is still using webUrl(https url) in some places and it triggered an issue today.

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Commit messages:
 - SKARA-2210

Changes: https://git.openjdk.org/skara/pull/1624/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1624&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2210
  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1624.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1624/head:pull/1624

PR: https://git.openjdk.org/skara/pull/1624