providers/vmware: fix casing in error messages
providers/vmware: fix casing in error messages

ajeddeloh/ignition,AlexNPavel/ignition,dgonyeo/ignition,coreos/ignition,dgonyeo/ignition,ajeddeloh/ignition,AlexNPavel/ignition,coreos/ignition,dgonyeo/ignition,AlexNPavel/ignition,coreos/ignition,ajeddeloh/ignition