Make es_util_env compatible with Python 2 and 3

Author: yselkowitz

elasticsearch/utils/es_util_env

@@ -11,11 +11,11 @@ get_security_conf_index() {
   local index=$( python -c 'import sys,yaml
 hsh = yaml.load(open(sys.argv[1]))
 if "searchguard" in hsh and "config_index_name" in hsh["searchguard"]:
-  print hsh["searchguard"]["config_index_name"]
+  print(hsh["searchguard"]["config_index_name"])
 elif "opendistro_security" in hsh and "config_index_name" in hsh["opendistro_security"]:
-  print hsh["opendistro_security"]["config_index_name"]
+  print(hsh["opendistro_security"]["config_index_name"])
 else:
-  print "unknown_security_index"
+  print("unknown_security_index")
 ' $es_config_file )
   echo $index
 }