Correct read mode causing permission deny if the file is not owned by the user.

Author: jshum2479

core/src/main/python/wlsdeploy/tool/create/atp_helper.py

@@ -68,7 +68,7 @@ def fix_jps_config(rcu_db_info, model_context):
 
 def get_atp_connect_string(tnsnames_ora_path, tns_sid_name):
     try:
-        f = open(tnsnames_ora_path, "r+")
+        f = open(tnsnames_ora_path, "r")
         try:
             text = f.read()
         finally: