Improve Slurm result parsing

[richcar58]

Tapis Jobs looks for the string "Submitted batch job " followed by some number of digits on the last line of the console output from a successful sbatch call. Some installations of Slurm sbatch, or some local variant or wrapper script, can sometimes output another line of text after the line we expect. Change the code sbatch parsing code to look at all output lines in reverse order and use the first one that fits the expected format.