RFR: 1198: Stop using fake non existing from email addresses

[Erik Joelsson]

With this patch, Skara mlbridge will no longer construct fake email addresses for users not in the census. Instead mails will be sent with the configured do-not-reply address (which is currently duke at openjdk.java.net). The full name of the user will still be added, just like before, so it's still possible for a human to see who made the comment that triggered the email.

Most of the changes are just adapting test cases that relied on this functionality. Those tests should still be valid as they are still verifying the full names correctly.

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Commit messages:
 - SKARA-1198

Changes: https://git.openjdk.java.net/skara/pull/1228/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1228&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1198
  Stats: 22 lines in 2 files changed: 0 ins; 9 del; 13 mod
  Patch: https://git.openjdk.java.net/skara/pull/1228.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1228/head:pull/1228

PR: https://git.openjdk.java.net/skara/pull/1228