[Creator] Add missing process to install Hatohol RPM.
[Checker] Fix function name:

print_true_message ->
print_container_exist_message

print_false_message ->
print_container_not_exitst_message
[Checker] Add a new function: is_hatohol_command_exstence()
[Checker] Add new function: check_hatohol_container()
[Checker] Add new function: is_zabbix_server_command_existence()
[Checker] Add a new function: is_provided_command_existence()

This function is used instead of is_hatohol_command_existence() and
is_zabbix_server_command_existence() functions.
[Checker] Use is_provided_command_existence() function instead of
is_hatohol_command_existence() function.
[Checker] Remove is_hatohol_command_existence() and
is_zabbix_server_command_existence() functions.
[Checker] Add a new function: check_zabbix_server_container()
[Checker] Add a new function: check_zabbix_agent_container()
[Checker] Add a new function: print_container_name()
[Checker] Use variable in check_hatohol_container() function.
[Checker] Use print_container_function().
[Checker] Add a new function: check_nagios_server3_container()
[Checker] Add a new function: check_nagios_server4_container()
[Checker] Fix wrong variable content.
[Checker] Fix wrong word.

command ->
file

Because, it isn't a command, it's a file.
[Checker] Add a new function: is_provided_directory_existence()
[Checker] Add a new function: check_nagios_nrpe_container()
[Checker] Add a new function: check_container_successfully()