Add support for checking out an arbitrary version.

The implementation only supports version that is stable (version files
under paladin directory), now add version that is not stable (aka -
under buildspec file).

PRESUBMIT=passed
BUG=None
R=llozano
CC=asharif,bjanakiraman,carrot,cmtice,yunlian,sque
APPROVED=llozano
OCL=66130-p2
RCL=66154-p2
RDATE=2013/03/01 09:16:21
TEST=Run `../v14/setup_chromeos.py --version=26.3701.30.1 --dir=26.3701.30.1`, the version specfile is under 'buildspec' directory.


P4 change: 43289842
1 file changed
tree: 58137c1e74ab7f6386a049345480110c31f769be
  1. .git5_specs/
  2. v14/