Fixes config merge fn for disabling coordinates and adds it to JSON.

command/agent/config.go

@@ -373,7 +373,7 @@ type Config struct {
 	AEInterval time.Duration `mapstructure:"-" json:"-"`
 
 	// DisableCoordinates controls features related to network coordinates.
-	DisableCoordinates bool `mapstructure:"disable_coordinates" json:"-"`
+	DisableCoordinates bool `mapstructure:"disable_coordinates"`
 
 	// SyncCoordinateRateTarget controls the rate for sending network
 	// coordinates to the server, in updates per second. This is the max rate
@@ -1087,6 +1087,9 @@ func MergeConfig(a, b *Config) *Config {
 	if b.AtlasEndpoint != "" {
 		result.AtlasEndpoint = b.AtlasEndpoint
 	}
+	if b.DisableCoordinates {
+		result.DisableCoordinates = true
+	}
 	if b.SessionTTLMinRaw != "" {
 		result.SessionTTLMin = b.SessionTTLMin
 		result.SessionTTLMinRaw = b.SessionTTLMinRaw