The value of tmnxChassisGoldenBootstrapImageSrc specifies the source
filepath or file-URL which will be saved as the golden bootstrap image
when tmnxChassisUpdateGoldenBootstrapImage is set to 'doAction'. If
'tmnxChassisGoldenBootstrapImage' is set to the empty string, ''H,
cf1:/boot.tim will be saved as the golden bootstrap image.