RFR: 749: If an integration fails at a late stage, it will both say that it succeeded and failed

[Robin Westberg]

Wait with outputting the success message until after the final push command during `/integrate` or `/sponsor` has actually completed.

-------------

Commit messages:
 - Perform the push before writing the success message

Changes: https://git.openjdk.java.net/skara/pull/985/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=985&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-749
  Stats: 7 lines in 2 files changed: 4 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/985.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/985/head:pull/985

PR: https://git.openjdk.java.net/skara/pull/985