Remove absolute path on knox binary (requiring the PATH variable to b…

…e set accurately)

client.go

@@ -97,10 +97,10 @@ func NewMock(primary string, active []string) Client {
 
 // Register registers the given keyName with knox. If the operation fails, it returns an error.
 func Register(keyID string) ([]byte, error) {
-	if output, err := exec.Command("/usr/bin/knox", "register", "-k", keyID).CombinedOutput(); err != nil {
+	if output, err := exec.Command("knox", "register", "-k", keyID).CombinedOutput(); err != nil {
 		return nil, fmt.Errorf("error registering knox key: %s %v '%q'", keyID, err, output)
 	}
-	cmd := exec.Command("/usr/bin/knox", "get", "-j", keyID)
+	cmd := exec.Command("knox", "get", "-j", keyID)
 	host, err := os.Hostname()
 	if err != nil {
 		return nil, fmt.Errorf("No hostname found: %s", err.Error())