Append ansible yaml parse errors to job log file

If ansible can't parse the yaml, it dies immediately with return code 4.
This happens before callback plugins, so nothing gets captured to
the log. Save the first 200 lines in case there result is a syntax
error. If we detect one, append directly to the job's log file.

Change-Id: I059a61357c471f61485f141f92c35b2bcf2d168d
1 file changed