libcontainerd/supervisor: remove unused options

This removes the `WithRemoteAddr()`, `WithRemoteAddrUser()`, `WithDebugAddress()`,
and `WithMetricsAddress()` options, added in ddae20c032058a0fd42c34c2e9750ee8f6296ac8,
but most of them were never used, and `WithRemoteAddr()` no longer in use since
dd2e19ebd58cd8896d79b4b8db61144b93717b33.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

libcontainerd/supervisor/remote_daemon_options.go

@@ -1,22 +1,5 @@
 package supervisor // import "github.com/docker/docker/libcontainerd/supervisor"
 
-// WithRemoteAddr sets the external containerd socket to connect to.
-func WithRemoteAddr(addr string) DaemonOpt {
-	return func(r *remote) error {
-		r.GRPC.Address = addr
-		return nil
-	}
-}
-
-// WithRemoteAddrUser sets the uid and gid to create the RPC address with
-func WithRemoteAddrUser(uid, gid int) DaemonOpt {
-	return func(r *remote) error {
-		r.GRPC.UID = uid
-		r.GRPC.GID = gid
-		return nil
-	}
-}
-
 // WithLogLevel defines which log level to starts containerd with.
 // This only makes sense if WithStartDaemon() was set to true.
 func WithLogLevel(lvl string) DaemonOpt {
@@ -26,24 +9,6 @@ func WithLogLevel(lvl string) DaemonOpt {
 	}
 }
 
-// WithDebugAddress defines at which location the debug GRPC connection
-// should be made
-func WithDebugAddress(addr string) DaemonOpt {
-	return func(r *remote) error {
-		r.Debug.Address = addr
-		return nil
-	}
-}
-
-// WithMetricsAddress defines at which location the debug GRPC connection
-// should be made
-func WithMetricsAddress(addr string) DaemonOpt {
-	return func(r *remote) error {
-		r.Metrics.Address = addr
-		return nil
-	}
-}
-
 // WithPlugin allow configuring a containerd plugin
 // configuration values passed needs to be quoted if quotes are needed in
 // the toml format.