Add note about port properties in internal metadata
Add note about port properties in internal metadata

joyent/sdc-docker,misterdjules/sdc-docker,misterdjules/sdc-docker,richardkiene/sdc-docker,owlin/sdc-docker,mehulsbhatt/sdc-docker,bixu/sdc-docker,joyent/sdc-docker,owlin/sdc-docker,bixu/sdc-docker,richardkiene/sdc-docker,mehulsbhatt/sdc-docker