fix(unit): match @ units properly

Author: Gabriel Monroy

client/unit.go

@@ -24,7 +24,7 @@ func (c *FleetClient) getUnits(target string) (units []string, err error) {
 	var r *regexp.Regexp
 	if strings.HasSuffix(target, "-data") {
 		r = regexp.MustCompile(`deis\-(` + target + `)\.service`)
-	} else if strings.Contains(target, ".") {
+	} else if strings.Contains(target, "@") {
 		r = regexp.MustCompile(`deis\-(` + target + `)\.service`)
 	} else {
 		r = regexp.MustCompile(`deis\-(` + target + `)@([\d]+)\.service`)