cbuildbot: do not print detailed stack trace
This is a partial revert of CL:241482 and also eliminates a caller to
TEST=Unit tests; git-grepping to ensure all non-unittest callers of
FormatDetailedTraceback are removed.
Reviewed-by: David James <email@example.com>
Commit-Queue: Aviv Keshet <firstname.lastname@example.org>
Tested-by: Aviv Keshet <email@example.com>
4 files changed