SWUTILS-968: Highlight SELinux as an interesting value

[dchadwic-xilinx]

This is motivated by a couple of occasions where SELinux was enabled but this was not noticed despite it being important to the diagnosis of the issue.
This patch also redesigns the change I made for #27 to the apply_interest_rules sub by supporting the case where the input value is an array.

I will note, the "Linux" being used by the context here is undesirable - more on that below.

[dchadwic-xilinx]

Re: the "Linux" bit in the Summary of interesting values. I could update the System Summary so that the new values[0] is a chosen word like "Configuration"

Suggested change

	my @attributes = ('', 'OS Name', 'Version', 'Architecture');
	my @value = ('Configuration', $os_type, "$os_release $os_version", $arch);

Which would give the following result:

Which is a little more elegant - but I would have worries for dataminer implications (shouldn't be an issue - but I'd want to spend some time making sure)

[KalepuAMD]

Isn't a enforcing means SELinux enabled and showing as disabled kind of contradicting?

[dchadwic-xilinx]

This is showing : Warning: <section_context> - <condition> (<real_value>)
Basically same as saying condition check <Selinux ne "Disabled"> failed, its actually ("Enforcing")

[ibeecraft-amd]

Useful to grab and the addition of string comparisons to interesting values is useful.