[Zabbix] Apply pep8.
[Utils] Add a new function: write_data_to_file()
[Setup] Use write_data_to_file() function.

And I define value in the argument as variable in following functions.
- run_setup_nagios_nrpe()
- run_setup_fluentd()
[Setup] Fix indent.
[Setup] Use write_data_to_file() function in run_setup_redmine()
function instead of create_setup_file().

I remove a create_setup_file() function because it is used at once in this script.
[Setup] Apply pep8.

Because when I checked the code using a tool which checks coding style of
Python(pep8), the tool shows following messages. But I fix a part of
messages...

$ pep8 setup.py
setup.py:18:1: E302 expected 2 blank lines, found 1
setup.py:273:26: E231 missing whitespace after ','
setup.py:276:40: E251 unexpected spaces around keyword / parameter
equals
setup.py:276:42: E251 unexpected spaces around keyword / parameter
equals
setup.py:277:43: E251 unexpected spaces around keyword / parameter
equals
setup.py:277:45: E251 unexpected spaces around keyword / parameter
equals
setup.py:277:80: E501 line too long (82 > 79 characters)
setup.py:278:40: E251 unexpected spaces around keyword / parameter
equals
setup.py:278:42: E251 unexpected spaces around keyword / parameter
equals
setup.py:319:12: E713 test for membership should be 'not in'
setup.py:326:80: E501 line too long (81 > 79 characters)
setup.py:335:13: E713 test for membership should be 'not in'
[Utils] Add missing line.
[Setup] Use load_asset_files() function in prepare_setup_redmine()
function.
[Utils] Add a new function: read_data_from_file()
[Utils] Fix a condition.
[Setup][Utils] Use read_data_from_file() function.