[Client] Corrected the problem that the server type is "unknown".

If select a server type Zabbix(HAP)/Zabbix(JSON)/Ceilometer at the time of registration,  
display of server type is "unknown" at page of Monitoring Servers and Action(Registration menu).
I modified this problem.
HAP_Zabbix -> Zabbix (HAPI)
HAP_Nagios -> Nagios (HAPI)
HAP_JSON -> General Plugin
HAP_Ceilometer -> Ceilometer