cli: add log-level option using capnslog
cli: add log-level option using capnslog

mjg59/mantle,mjg59/mantle,marineam/mantle,dm0-/mantle,mischief/mantle,dm0-/mantle,glevand/coreos--mantle,quantum/coreos-mantle,quantum/coreos-mantle,glevand/coreos--mantle,marineam/mantle,mischief/mantle