start.go: Set chronyd in manual mode

[praveenkumar]

From 4.17 kubelet-dependency.target have chrony-wait-service as dependency which start the chrony service again in the VM and set the time back to normal which cause no cert rotation for cluster and test are failing.

This PR set the chrony conf to manual which prevent to update the VM time even restart of chronyd service.

Fixes: #4337

Dependency: crc-org/snc#1016

To test this try following

$ crc setup  -b https://storage.googleapis.com/crc-bundle/crc_libvirt_4.19.0-ec.2_amd64_1016.crcbundle
$ sudo timedatectl set-ntp off
$ sudo date -s '13 month'
$ CRC_DEBUG_ENABLE_STOP_NTP=true  ./crc start -b https://storage.googleapis.com/crc-bundle/crc_libvirt_4.19.0-ec.2_amd64_1016.crcbundle --log-level debug

[openshift-ci]

@praveenkumar: The following test 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-crc	2a1fdcc	link	true	/test e2e-crc

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[openshift-ci]

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