RFR: 8288114: Update JIRA link in vcs.xml

[Alexey Ivanov]

Update the link to JBS in `vcs.xml` template to https://bugs.openjdk.org/

It will affect newly generated project files only.  
Edit `vcs.xml` manually or in UI to update in existing projects.

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Commit messages:
 - 8288114: Update JIRA link in vcs.xml

Changes: https://git.openjdk.org/jdk/pull/9130/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9130&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288114
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9130.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9130/head:pull/9130

PR: https://git.openjdk.org/jdk/pull/9130