[Rev 04] RFR: Create forges from service providers

[Robin Westberg]

The pull request has been updated with additional changes.

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Added commits:
 - a501ef5e: Restore retry functionality

Changes:
  - all: https://git.openjdk.java.net/skara/pull/223/files
  - new: https://git.openjdk.java.net/skara/pull/223/files/84f37fab..a501ef5e

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/223/webrev.04
 - incr: https://webrevs.openjdk.java.net/skara/223/webrev.03-04

  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/223.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/223/head:pull/223

PR: https://git.openjdk.java.net/skara/pull/223