Fix bug in custom version key generation.

Instead of using '%' which is a shell special character, and may be
expanded in certain cases, use the safer '__' separator.  We use double
underscore for better readability.

TEST=Ran on a buildbot and locally.

Change-Id: If82f74effc3f977f5e58d543a097198688347e21
Reviewed-by: Mike Frysinger <>
Commit-Queue: Ryan Cui <>
Tested-by: Ryan Cui <>
1 file changed