RFR: Batch add tags in the notifier bot

[Robin Westberg]

Hi all,

Please review this change that allows adding multiple tags in one run when starting to run the notifier for the new repository. Previously, for a repository with many tags, a separate commit would be generated for each.

Best regards,
Robin

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Commits:
 - 1b5eae57: And use it in the notifier bot
 - ac0bef37: Allow updating more than one item at a time for Storage

Changes: https://git.openjdk.java.net/skara/pull/174/files
 Webrev: https://webrevs.openjdk.java.net/skara/174/webrev.00
  Stats: 85 lines in 10 files changed: 34 ins; 7 del; 44 mod
  Patch: https://git.openjdk.java.net/skara/pull/174.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/174/head:pull/174

PR: https://git.openjdk.java.net/skara/pull/174