[devscripts] Add a trim toggle for ocp vms

[michburk]

Testing a remedy for growing disk util for hypervisors waiting in the premetal pool

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Build failed (check pipeline). Post recheck (without leading slash)
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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/0575a266843e4dfe95dc169271903dda

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 45m 53s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 26m 04s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 32m 52s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 32s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 11s
❌ cifmw-pod-pre-commit FAILURE in 8m 49s
✔️ cifmw-molecule-devscripts SUCCESS in 9m 35s

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Build failed (check pipeline). Post recheck (without leading slash)
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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/f541b946c0b2468585db118d4271cb91

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 52m 00s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 27m 22s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 38m 40s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 40s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 50s
❌ cifmw-pod-pre-commit FAILURE in 8m 33s
✔️ cifmw-molecule-devscripts SUCCESS in 9m 28s

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Build failed (check pipeline). Post recheck (without leading slash)
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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/d569cdeb383746ba88d0e73c47dbe547

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 54m 28s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 26m 13s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 40m 52s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 06s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 14s
❌ cifmw-pod-pre-commit FAILURE in 8m 32s
✔️ cifmw-molecule-devscripts SUCCESS in 10m 24s