Update hostname when transient hostname is fedora

[bdurrow]

A recent change, perhaps the adoption of fcos 33 broke hostname assignment (at least in GCP) because the transient hostname was set to fedora on boot. We need to use the dhcp provided hostname in this case.

- What I did
Modified templates/common/_base/files/etc-networkmanager-dispatcher.d-90-long-hostname.yaml so that the string fedora is treated like localhost when we check to see if the hostname was previously set.

- How to verify it
Build a 4.6 cluster in GCP.

- Description for the changelog

Use dhcp provided hostname when transient hostname is fedora

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[openshift-ci-robot]

Hi @bdurrow. Thanks for your PR.

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[vrutkovs]

Sorry for confusion, but fcos branch is for OKD 4.5. Please re-submit this for master (or release-4.6 branch) to this out on OKD 4.6

[vrutkovs]

Verified that this fix works on OKD 4.6 in GCP. However its odd that default hostname is fedora, it would be easier to keep it localhost on FCOS side

[bdurrow]

Rebased in #2160