IMGAPI-475: give image UUID context in 404 error bodies
IMGAPI-475: give image UUID context in 404 error bodies

joyent/sdc-imgapi,numericillustration/sdc-imgapi,numericillustration/sdc-imgapi,joyent/sdc-imgapi,numericillustration/sdc-imgapi,joyent/sdc-imgapi