Return OpTypeList for singular plurals

[brycahta]

Issue #, if available: N/A, heuristic is returning ReadOne operation for DescribeDhcpOptions when it is a ReadMany call

Description of changes:

• returns OpTypeList instead of OpTypeGet for "singular plural" in "Describe" processing
• removes duplicate code
• updates comments on singular-plural description to be clearer and present in all affected areas

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jaypipes]

I was thinking this would be a single line changed (line 128, changed to OpTypeList instead of OpTypeGet to deal with the DhcpOption misnaming...) but I see a bunch of changes here.

[brycahta]

I was thinking this would be a single line changed (line 128, changed to OpTypeList instead of OpTypeGet to deal with the DhcpOption misnaming...) but I see a bunch of changes here.

Yeah, did some cleanup while here.. tried to break out by commits; sorry if it's still cluttered. No other functionality was added/updated.

[vijtrip2]

/approve

[brycahta]

I was thinking this would be a single line changed (line 128, changed to OpTypeList instead of OpTypeGet to deal with the DhcpOption misnaming...) but I see a bunch of changes here.

Got it, backed out clarifications

[vijtrip2]

/lgtm

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