RFR: 1108: Fix label updater for gitlab [v2]

[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.

Erik Joelsson has updated the pull request incrementally with one additional commit since the last revision:

  Update test

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1196/files
  - new: https://git.openjdk.java.net/skara/pull/1196/files/ce5cc670..fb7c65b1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1196&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1196&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 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