Make bootstrap image asset depend on rhcos image.

[patrickdillon]

The bootstrap image asset calls the rhcos package to determine the rhcos image for the boostrap node. Instead it should
look for the rhcos image in the asset store.

[kwoodson]

@patrickdillon Thanks, I'll try this out.

[kwoodson]

@patrickdillon This worked for me.

/lgtm

[openshift-ci]

@patrickdillon: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openstack-kuryr	806937b	link	false	/test e2e-openstack-kuryr
ci/prow/e2e-aws-workers-rhel8	806937b	link	false	/test e2e-aws-workers-rhel8
ci/prow/e2e-aws-workers-rhel7	806937b	link	false	/test e2e-aws-workers-rhel7
ci/prow/e2e-ovirt	806937b	link	false	/test e2e-ovirt
ci/prow/e2e-metal-single-node-live-iso	806937b	link	false	/test e2e-metal-single-node-live-iso
ci/prow/e2e-metal-ipi-ovn-ipv6	806937b	link	false	/test e2e-metal-ipi-ovn-ipv6
ci/prow/e2e-crc	806937b	link	false	/test e2e-crc

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[staebler]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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