Add an option to set the default cache dir

PRESUBMIT=passed
R=llozano,asharif,shenhan
APPROVED=shenhan
DELTA=65  (44 added, 9 deleted, 12 changed)
OCL=65503-p2
RCL=65570-p2
RDATE=2013/01/31 09:32:35


P4 change: 42806538
4 files changed
tree: 07244d1e0b74df08426958b7a3775b0fcb2d76c6
  1. .git5_specs/
  2. v14/