log: add stdout logger
log: add stdout logger

mischief/ignition,AlexNPavel/ignition,coreos/ignition,AlexNPavel/ignition,jonboulle/ignition,higebu/ignition,marineam/ignition,jonboulle/ignition,crawford/ignition,ajeddeloh/ignition,marineam/ignition,coreos/ignition,higebu/ignition,crawford/ignition,trnubo/ignition,trnubo/ignition,marineam/ignition,ajeddeloh/ignition,mischief/ignition,mischief/ignition,dgonyeo/ignition,trnubo/ignition,higebu/ignition,ajeddeloh/ignition,jonboulle/ignition,dgonyeo/ignition,AlexNPavel/ignition,coreos/ignition,dgonyeo/ignition