V-71849, V-71855, V-72037 - wording change for disabled controls

[ejaronne]

https://github.com/simp/inspec-profile-disa_stig-el7/blob/master/controls/V-71849.rb https://github.com/simp/inspec-profile-disa_stig-el7/blob/master/controls/V-71855.rb https://github.com/simp/inspec-profile-disa_stig-el7/blob/master/controls/V-72037.rb

For clarity and simplicity, recommend changing:

  skip "This control consistently takes a long time to run and has been disabled
        using the disable_slow_controls attribute. You must enable this control for a
        full accredidation for production."

to simply:

skip "This control consistently takes a long time to run and has been disabled using the disable_slow_controls attribute. You must enable this control to ensure its tests are performed."

(Also: typo: V-71849 line 3 # Support for passed in Atrributes)