Added better exception handling for Celestica Cumulus upgrades in cumulus-bootstrap
Added better exception handling for Celestica Cumulus upgrades in cumulus-bootstrap

Also added a more generic ONIE prompt regex in cumulus-bootstrap

Apstra/aeon-ztps,Apstra/aeon-ztps,Apstra/aeon-ztps,Apstra/aeon-ztps,Apstra/aeon-ztps