providers: add MockProvider
providers: add MockProvider

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