Integrated: Use proper build number formatting

[Robin Westberg]

Low build numbers should use a leading 0 for the custom field.

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Commit messages:
 - Use proper build number formatting

Changes: https://git.openjdk.java.net/skara/pull/934/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=934&range=00
  Stats: 21 lines in 2 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/934.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/934/head:pull/934

PR: https://git.openjdk.java.net/skara/pull/934