RFR: Initial version of CLI tool for hgupdate-sync label [v2]

[Robin Westberg]

> An initial version of a hgupdate-sync-label CLI tool with associated refactorings, in preparation for further enhancements.

Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:

  Fix tests

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1002/files
  - new: https://git.openjdk.java.net/skara/pull/1002/files/bdce8267..82fc6947

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1002&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1002&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/1002.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1002/head:pull/1002

PR: https://git.openjdk.java.net/skara/pull/1002