RFR: 1235: git sync --branches doesn't work as expected [v2]

[Zhao Song]

> Make git sync --branches works as expected.
> 
> The argument after git sync --branches will not be ignored right now.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  dummy commit

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1381/files
  - new: https://git.openjdk.org/skara/pull/1381/files/eccff671..0ef0bfa9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1381&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1381&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1381.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1381/head:pull/1381

PR: https://git.openjdk.org/skara/pull/1381