Add option to watch List object types

[varshaprasad96]

This commit modifies dependentResourceWatcher to
accept List kinds while watching dependent resources.
It also adds test to verify if setWatchOnResource
works for lists.

Reference: operator-framework/operator-sdk#4682

Signed-off-by: varshaprasad96 varshaprasad96@gmail.com
Closes: #89

[coveralls]

Pull Request Test Coverage Report for Build 1532265509

• 34 of 40 (85.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.2%) to 62.216%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/reconciler/internal/hook/hook.go	34	40	85.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/reconciler/internal/hook/hook.go	1	89.86%

Totals
Change from base Build 1476478121:	0.2%
Covered Lines:	1696
Relevant Lines:	2726

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💛 - Coveralls

[joelanford]

/lgtm