This complements https://review.opendev.org/#/c/679407 allowing
deep_compare and update_settle_secs to be set globally via:
tripleo::fencing::deep_compare: true
tripleo::fencing::update_settle_secs: XXX
Depends-on: https://review.opendev.org/#/c/679407
Change-Id: I0e1a8da4112479f39ad72fd7184ad5838c5b59fe