RFR: 1789: Skara PR commands are not interpreted on Github review comments

[Zhao Song]

A user reported that Skara bots were not responding to commands in review comments or the body of a review. 

This patch addresses that issue by ensuring that the Skara bots can correctly detect and interpret commands.

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Commit messages:
 - SKARA-1789

Changes: https://git.openjdk.org/skara/pull/1458/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1458&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1789
  Stats: 58 lines in 2 files changed: 55 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/skara/pull/1458.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1458/head:pull/1458

PR: https://git.openjdk.org/skara/pull/1458