make KV environments/ read-only for non-platform components
make KV environments/ read-only for non-platform components

Fixes #157

gozer/nubis-consul,gozer/nubis-consul,limed/nubis-consul,Nubisproject/nubis-consul,Nubisproject/nubis-consul,tinnightcap/nubis-consul,Nubisproject/nubis-consul,gozer/nubis-consul,tinnightcap/nubis-consul,limed/nubis-consul