Return Correct Error on Context Cancellation

[patrick-ogrady]

Motivation

• If context is cancelled, retry methods in the fetcher package return an incorrect error (exhausted retries instead of context error).
• If context is cancelled, the reconciler can silence the ctx.Err() and return nil instead.

Solution

Return the correct error.

[coveralls]

Pull Request Test Coverage Report for Build 1357

• 60 of 68 (88.24%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-4.08%) to 64.462%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
reconciler/reconciler.go	0	8	0.0%

Totals
Change from base Build 1285:	-4.08%
Covered Lines:	1277
Relevant Lines:	1981

---

💛 - Coveralls

[patrick-ogrady]

Decrease in coverage is deceptive because tests were added to areas of the code that were previously untested.