Revert "remove provisioner checks (#4254)" (#4375)

* Revert "remove provisioner checks (#4254)"

This reverts commit 71e76705.

* Remove TODO in implementer's guide
23 jobs for master in 45 minutes and 53 seconds (queued for 13 seconds)
Name Stage Failure
failed
check-dependent-cumulus Build
    ... which satisfies dependency `derive_more = "=0.99.16"` of package `cumulus-client-network v0.1.0 (/builds/parity/polkadot/cumulus/client/network)`
... which satisfies path dependency `cumulus-client-network` of package `cumulus-client-collator v0.1.0 (/builds/parity/polkadot/cumulus/client/collator)`
... which satisfies path dependency `cumulus-client-collator` of package `cumulus-client-service v0.1.0 (/builds/parity/polkadot/cumulus/client/service)`
... which satisfies path dependency `cumulus-client-service` of package `cumulus-test-service v0.1.0 (/builds/parity/polkadot/cumulus/test/service)`
... which satisfies path dependency `cumulus-test-service` of package `cumulus-client-pov-recovery v0.1.0 (/builds/parity/polkadot/cumulus/client/pov-recovery)`

failed to select a version for `derive_more` which could resolve this conflict
Cleaning up file based variables
ERROR: Job failed: exit code 1