RFR: 1108: Fix label updater for gitlab

[Erik Joelsson]

When deploying SKARA-1084 I discovered that gitlab doesn't accept '<' or '>' in label descriptions. The email address toString() method returns the email inside those characters. I don't think we need to store that in the description so simply switch to adding the .address() instead.

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Commit messages:
 - SKARA-1108

Changes: https://git.openjdk.java.net/skara/pull/1196/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1196&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1108
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1196.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1196/head:pull/1196

PR: https://git.openjdk.java.net/skara/pull/1196