RFR: 1885: Add method deleteDeployKeys to HostedRepository [v3]

[Zhao Song]

> The method deleteDeployKeys is designed to delete deploy keys from this repository.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  fix problems

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Changes:
  - all: https://git.openjdk.org/skara/pull/1505/files
  - new: https://git.openjdk.org/skara/pull/1505/files/956b72a2..824afe26

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1505&range=02
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1505&range=01-02

  Stats: 8 lines in 5 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/skara/pull/1505.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1505/head:pull/1505

PR: https://git.openjdk.org/skara/pull/1505