Add option to allow SimpleConfig to strip trailing whitespace

[miah]

This PR Updates SimpleConfig to allow users to strip trailing whitespace from parsed values. The :strip_values option is defaulted to false, users must explicitly enable it.

Note the whitespace after www.inspec.test:

SimpleConfig.new('ServerAlias www.inspec.test ', assignment_regex: /^\s*(\S+)\s+(.*)\s*$/, multiple_values: true, strip_values: true)

Will result in params including { 'ServerAlias' => ['www.inspec.test'] }

This PR also updates the apache_conf resource to enable :strip_values by default.

Because Apache allows you to pass multiple values, and define the setting more than once you can still end up with parameters like this:

# apache2.conf
ServerAlias io.inspec.test inspec.test
ServerAlias www.inspec.test

{ 'ServerAlias' => ['io.inspec.test inspec.test', 'www.inspec.test'] }

But they will no longer include trailing whitespace =)

Fixes #1241

[adamleff]

So, I'm a bit on-the-fence on this change. Part of me thinks that this feature shouldn't be necessary; the assignment_regex should just be written properly to not be greedy and pull in spaces. Am I crazy for thinking that?

Also, I think I'm going to engage SUPER PEDANT MODE and suggest that (if we proceed with this change) the parameter be named strip_whitespace to make it clearer to the user what the outcome will be.

Let's chat about this sometime tomorrow if you don't mind!

[miah]

I was also on the fence with this change. I worked with @jerryaldrichiii on a regex solution to this. New PR incoming =)

[adamleff]

@miah thank you for going back and taking a second look at it after the initial feedback!