change checkoutput to popen in subprocess calles due to old centos 6

roles/provision_slurm/templates/provision_slurm.py.j2

@@ -45,14 +45,17 @@ def get_users(server):
 
 
 def mk_slurmaccount(acct):
-    output=subprocess.check_output(["{{ slurm_dir }}/bin/sacctmgr","--noheader","list","account",acct])
+    p=subprocess.Popen(["{{ slurm_dir }}/bin/sacctmgr","--noheader","list","account",acct],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
+    (output,error)=p.communicate()
     if acct in output:
         return
     else:
         subprocess.call(["{{ slurm_dir }}/bin/sacctmgr","-i","create","account",acct])
 
 def mk_slurmuser(user,acct):
-    output=subprocess.check_output(["{{ slurm_dir }}/bin/sacctmgr","--noheader","list","Association","user=%s"%user,"format=account"])
+    p=subprocess.Popen(["{{ slurm_dir }}/bin/sacctmgr","--noheader","list","Association","user=%s"%user,"format=account"],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
+
+    (output,error)=p.communicate()
     if acct in output.splitlines():
         return
     else: