RFR: 1150: Migrate skara tooling for client code to reference the new client-libs-dev list [v2]

[Erik Joelsson]

> Here is my attempt at trying to rewrite the rules for automatic labeling for the new "client" label and client-libs-dev mailing list. I took the combined contents of the previous 2d, awt, sound and swing labels, sorted the lines and then tried to manually merge as much as possible. It's possible I didn't get everything correct or at least not fully optimized.

Erik Joelsson has updated the pull request incrementally with two additional commits since the last revision:

 - Renamed label to client
 - Simplified mappings based on feedback

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1216/files
  - new: https://git.openjdk.java.net/skara/pull/1216/files/06490edd..2c0dfee7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1216&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1216&range=00-01

  Stats: 40 lines in 1 file changed: 2 ins; 32 del; 6 mod
  Patch: https://git.openjdk.java.net/skara/pull/1216.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1216/head:pull/1216

PR: https://git.openjdk.java.net/skara/pull/1216