[Checker] Fix the function names.

print_hatohol_is_installed_successfully ->
print_installation_result_of_hatohol

print_zabbix_server_is_installed_successfully ->
print_installation_result_of_zabbix_server

print_zabbix_agent_is_installed_successfully ->
print_installation_result_of_zabbix_agent

print_nagios_server3_is_installed_successfully ->
print_installation_result_of_nagios_server3

print_nagios_server4_is_installed_successfully ->
print_installation_result_of_nagios_server4

print_nagios_nrpe_is_installed_successfully ->
print_installation_result_of_nagios_nrpe

print_redmine_is_installed_successfully ->
print_installation_result_of_redmine

print_fluentd_is_installed_successfully ->
print_installation_result_of_fluentd