Fix test for SLURM_CPUS_PER_TAASK env var mod

testsuite/expect/test1.27

@@ -66,7 +66,7 @@ array set good_vars {
 # Spawn a job via srun to print environment variables
 #
 set timeout $max_job_delay
-set srun_pid [spawn $srun -N1 -n1 -t1 $bin_env]
+set srun_pid [spawn $srun -N1 -n1 --cpus-per-task=1 -t1 $bin_env]
 expect {
 	-re "(SLURM_$alpha_under)=($alpha_numeric_under)" {
 		set found_vars($expect_out(1,string)) "$expect_out(2,string)"