[devscripts] Add a trim toggle for ocp master vms

[michburk]

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

[openshift-ci]

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[centosinfra-prod-github-app]

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