Add Reconciler Active/Inactive Concurrency Configuration

[patrick-ogrady]

Motivation

Fix #28.

Solution

After some initial consideration to create a shared reconciliation goroutine pool (that always preferred active reconciliations to inactive reconciliations), I decided to stick with the 2 pool route and add a configuration to control the concurrency of each.

There are certain cases where you would not always want to prefer active reconciliations to inactive (for example, in the case where there are so many active reconciliations queued that you never do inactive reconciliations) so I opted for this dual configuration option en lieu of developing some complicated heuristic.

[coveralls]

Pull Request Test Coverage Report for Build 1279

• 15 of 18 (83.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 68.546%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
reconciler/reconciler.go	9	12	75.0%

Totals
Change from base Build 1257:	0.03%
Covered Lines:	1009
Relevant Lines:	1472

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💛 - Coveralls