symbolizer: make it more robust.

1. Create the output directory specified if it doesn't exist.
2. Keep symbolizing reports even if one fails in the middle.

Tested: python symbolizer.py --in=... --out=... --cache=... works.

PRESUBMIT=passed
R=sque,bjanakiraman
DELTA=8  (3 added, 0 deleted, 5 changed)
OCL=66071-p2
RCL=66079-p2
RDATE=2013/02/26 13:37:04


P4 change: 43132670
1 file changed
tree: 58666ffbe8a66a518ad94a1562ab94d8d1c82f15
  1. .git5_specs/
  2. v14/