updated Status.ObservedGeneration for pullsubscription and storage

[capri-xiyue]

Fixes #272

Proposed Changes

• Update status.ObservedGeneration for sources resources when sources resources get reconciled successfully
• Added unit tests

Release Note

None

[knative-prow-robot]

Hi @capri-xiyue. Thanks for your PR.

I'm waiting for a google member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[capri-xiyue]

/assign @Harwayne

[n3wscott]

/ok-to-test

[knative-metrics-robot]

The following is the coverage report on pkg/.
Say /test pull-google-knative-gcp-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/pullsubscription/pullsubscription.go	66.7%	66.8%	0.2
pkg/reconciler/storage/storage.go	66.9%	67.1%	0.2

[n3wscott]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: capri-xiyue, n3wscott

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