Integrated: 2245: Don't check security in JiraIssueTrackerFactory

[Zhao Song]

In [SKARA-2244](https://bugs.openjdk.org/browse/SKARA-2244), we removed security in JiraHost but I forget to remove the condition of 'configuration.contains("security")' in JiraIssueTrackerFactory.
So currently, if there is no security field in the configuration file, the factory would also ignore the visibility.

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Commit messages:
 - SKARA-2245

Changes: https://git.openjdk.org/skara/pull/1643/files
  Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1643&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-2245
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1643.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1643/head:pull/1643

PR: https://git.openjdk.org/skara/pull/1643