Operators should be reconciled on actual CatalogSources change

[tmshort]

Follow on to #205

Background:

When reconciling operator CRs, the operator-controller builds a list of constraints based on operator CRs and attempts to solve those constraints by considering content available in catalogSources. If the content within a catalogSource changes, a new solution may be available for a set of constraints that had failed earlier.

The operator controller should be updated to watch catalogSources. On changes that affect the catalogContent, the operator controller should queue all operator CRs to be reconciled.

Demo Script:

install OLM V1
Remove the default catalogSource
Create an Operator CR that does exists in the catalog
Check that it fails
Recreate the default catalogSource
Check that the package defined in the operator CR is deployed