Move to the v1beta1 Conditions implementation.

[mattmoor]

See here for more context on what's changed (no breaking changes): knative/pkg#361

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattmoor

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[knative-metrics-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/reconciler/build/build.go	69.5%	68.8%	-0.8

[mattmoor]

/retest

[imjasonh]

/test pull-knative-build-integration-tests

[knative-prow-robot]

@mattmoor: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-knative-build-integration-tests	b720948	link	/test pull-knative-build-integration-tests

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[vdemeester]

@mattmoor knative/pkg now uses apps instead of extensions for Deployment (see knative/pkg@8b3dc0d). Might be why the e2e fails