Support using an Ironic object to fetch the necessary information on start-up

[dtantsur]

With the introduction of ironic-standalone-operator and its Ironic resource, BMO can potentially fetch most information it needs on start-up (Ironic location, networking and credentials) from such an object. Together with #2100, it may make the existence of deploy.sh/deploy-cli unnecessary. The installation then will boil down to something like

make install deploy IRONIC_NAME=my-ironic

/kind feature

[Rozzii]

/triagge accepted

[Rozzii]

/triage accepted

[metal3-io-bot]

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/lifecycle stale

[Rozzii]

/remove-lifecycle stale