RFR: Improve materialization speed

[Robin Westberg]

Hi all,

Please review this change that allows materializing a HostedRepository using a common shared "seed", and make use of it in the PR bot.

Best regards,
Robin

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Commits:
 - bdd86cbd: Use in pr bot
 - 1673d312: Initial implementation

Changes: https://git.openjdk.java.net/skara/pull/411/files
 Webrev: https://webrevs.openjdk.java.net/skara/411/webrev.00
  Stats: 206 lines in 12 files changed: 186 ins; 2 del; 18 mod
  Patch: https://git.openjdk.java.net/skara/pull/411.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/411/head:pull/411

PR: https://git.openjdk.java.net/skara/pull/411