RFR: 1393: PR bot fails on missing .jcheck/conf [v9]

[Zhao Song]

> SKARA-1393 describes a problem related with `.jcheck/conf` missing.
> 
> In this patch, when the problem happens, the author of this pull request will get instructions about how to solve this problem.

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

  Add some logs when catching MissingJCheckConfException and InvalidJCheckConfException

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Changes:
  - all: https://git.openjdk.org/skara/pull/1407/files
  - new: https://git.openjdk.org/skara/pull/1407/files/ac43ad15..80e170d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1407&range=08
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1407&range=07-08

  Stats: 6 lines in 2 files changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1407.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1407/head:pull/1407

PR: https://git.openjdk.org/skara/pull/1407