update for python3: string needed decoding from bytes

setup.py

@@ -178,12 +178,12 @@ def update_branch(names_from_conf,name_from_list,pars,git_proto):
 print(bcolors.BOLDWHITE+"Step 0: Running self git pull"+bcolors.ENDC)
 selfpullresult = subprocess.check_output("git pull",shell=True)
 
-if selfpullresult.strip()!="Already up-to-date." and \
-   selfpullresult.strip()!="Already up to date.":
-  print(bcolors.WARNING+"Wasn't up-to-date. Please, rerun ./setup.py"+bcolors.ENDC)
-  sys.exit()
+if selfpullresult.strip().decode('utf-8')!="Already up-to-date." and \
+   selfpullresult.strip().decode('utf-8')!="Already up to date.":
+    print(bcolors.WARNING+"Wasn't up-to-date. Please, rerun ./setup.py"+bcolors.ENDC)
+    sys.exit()
 else:
-  print("ok")
+    print("ok")
 
 project_branches = read_local_conf("poky/build/conf/local.conf","ELPHEL393_branches")