fix 3 issues for xcatha.py -a

[bybai]

Fix 3 issues:

1. fix remove one more goconserver

   2018-06-22 05:12:16,124 - INFO - ===> Start all services stage <===
   Traceback (most recent call last):
   File "./xcatha.py", line 1194, in <module>
   main()
   File "./xcatha.py", line 1162, in main
   interactive_activate(obj,args.virtual_ip,args.dbtype)
   File "./xcatha.py", line 1143, in interactive_activate
   obj.start_all_services(service_list, dbtype, restore_host_name)
   File "./xcatha.py", line 182, in start_all_services
   servicelist.remove('goconserver')
   ValueError: list.remove(x): x not in list

2. "get_hostname_for_ip" should return short name.
3. remove "\n" from hostname