DisableNetworkBidge doesn't need to be public anymore

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Return errors in NewDaemonFromDirectory instead of calling Fatal

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Merge pull request #8068 from jfrazelle/cleanup-various-fix-me-refs

Cleanup various fix me refs