Made script pep8 compliant
Made script pep8 compliant

  - no functional changes
  - made adhere to Python Styleguid except for E501
    (E501 => no lines longer than 80 characters)

mzupan/nagios-plugin-mongodb,hdeheer/nagios-plugin-mongodb,a-yiorgos/nagios-plugin-mongodb,MingjunZhao/Mapscape-Nagios-Mongo,alexp789/nagios-plugin-mongodb,Elbandi/nagios-plugin-mongodb,warrenpnz/nagios-plugin-mongodb,adrianlzt/nagios-plugin-mongodb