lnd+server: Allow configurable Node Alias and Color

This commit sets the Node's Alias and Color to the values set in config.

server_test.go

@@ -0,0 +1,34 @@
+package main
+
+import "testing"
+
+func TestParseHexColor(t *testing.T) {
+	empty := ""
+	color, err := parseHexColor(empty)
+	if err == nil {
+		t.Fatalf("Empty color string should return error, but did not")
+	}
+
+	tooLong := "#1234567"
+	color, err = parseHexColor(tooLong)
+	if err == nil {
+		t.Fatalf("Invalid color string %s should return error, but did not",
+			tooLong)
+	}
+
+	invalidFormat := "$123456"
+	color, err = parseHexColor(invalidFormat)
+	if err == nil {
+		t.Fatalf("Invalid color string %s should return error, but did not",
+			invalidFormat)
+	}
+
+	valid := "#C0FfeE"
+	color, err = parseHexColor(valid)
+	if err != nil {
+		t.Fatalf("Color %s valid to parse: %s", valid, err)
+	}
+	if color.R != 0xc0 || color.G != 0xff || color.B != 0xee {
+		t.Fatalf("Color %s incorrectly parsed as %v", valid, color)
+	}
+}