RFR: 2040: Temporary workaround of SKARA-2025

[Zhao Song]

The final solution for [SKARA-2025](https://bugs.openjdk.org/browse/SKARA-2025) should be for us to optimize the HostedRepositoryPool#materializeClone method, but this will take some time. 

And some users would use /tag command every week, to make their experiences better, we should fix it with the temporary workaround as soon as possible. 

As Erik said in [SKARA-2025](https://bugs.openjdk.org/browse/SKARA-2025), we only need to fetch from the remote repo into local repo and the problem could be solved.

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Commit messages:
 - SKARA-2040
 - SKARA-2040

Changes: https://git.openjdk.org/skara/pull/1561/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1561&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2040
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1561.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1561/head:pull/1561

PR: https://git.openjdk.org/skara/pull/1561