Merge branch 'ld/p423'

Code preparation to make "git p4" closer to be usable with Python 3. * ld/p423: git-p4: python3: fix octal constants git-p4: python3: use print() function git-p4: python3: basestring workaround git-p4: python3: remove backticks git-p4: python3: replace dict.has_key(k) with "k in dict" git-p4: python3: replace <> with !=