Teach scc-check milestone to use remote branch as end point

This commit should enable command as
scc check-milestone 5.0.1 dev_5_0 --set 5.0.2
merge master -D org: PR 159 (Tag release prefix)
merge master -D org: PR 166 (Teach scc-check milestone to use remote branch as end point)
merge master -D org

Repository: openmicroscopy/snoopycrimecop
Excluded PRs:
  # PR 165 joshmoore 'Add 'rate' command' (status: error)
Already up-to-date.

Merged PRs:
  # PR 159 sbesson 'Tag release prefix'
  # PR 166 sbesson 'Teach scc-check milestone to use remote branch as end point'

Generated by SCC-merge#331 (http://ci.openmicroscopy.org/job/SCC-merge/331/)