Merge branch 'mt/p4-parse-G-output'

Use "p4 -G" to make "p4 changes" output more Python-friendly to parse. * mt/p4-parse-G-output: git-p4: filter for {'code':'info'} in p4CmdList git-p4: parse marshal output "p4 -G" in p4 changes git-p4: git-p4 tests with p4 triggers