slurm: remove --uid option (redundant with sudo) (#65)

- The --uid option is not allowed for non-root users anymore in Slurm
  17.11.5 (at least)...
- Since we submit using sudo, this option seems to be no longer needed.

Author: rkdarst

batchspawner/batchspawner.py

@@ -476,7 +476,6 @@ class SlurmSpawner(UserEnvMixin,BatchSpawnerRegexStates):
 #SBATCH --workdir={homedir}
 #SBATCH --mem={memory}
 #SBATCH --export={keepvars}
-#SBATCH --uid={username}
 #SBATCH --get-user-env=L
 #SBATCH {options}