RFR: jcheck: add asString when parsing INI values

[Erik Helin]

Hi all,

please review this patch that adds a call to `toString` when comparing the value
for the `bugids` field from the `.jcheck/conf` of older format.

Testing:
- `make test` passes on Linux x64

Thanks,
Erik

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Commit messages:
 - jcheck: add asString when parsing INI values

Changes: https://git.openjdk.java.net/skara/pull/548/files
 Webrev: https://webrevs.openjdk.java.net/skara/548/webrev.00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/548.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/548/head:pull/548

PR: https://git.openjdk.java.net/skara/pull/548