Add Cisco ASA detection

[thheinen]

Description

Add detection of Cisco ASA security appliances.

Related Issue

none

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New content (non-breaking change)
• Breaking change (a content change which would break existing functionality or processes)

Checklist:

• I have read the CONTRIBUTING document.

[codeclimate]

Code Climate has analyzed commit f1611fb and detected 9 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	2
Style	6
Bug Risk	1

View more on Code Climate.

[kekaichinose]

Pushing this to Backlog to look at once we get Cisco resources to use for verification

[thheinen]

If this helps, I might be able to give you remote access to one.

That won't help much for continued verification, though. For that case, it would be better to set up some GNS3- or VIRL-based solution in your infrastructure (which'd be needed for later in-depth Cisco work anyway).

[tas50]

@tecracer-theinen Any chance you can rebase this one?