[#92] nns: Mention domain in panic messages

Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>

@@ -222,3 +222,3 @@
 	fragments := splitAndCheck(name)
 	if fragments == nil {
-		panic("invalid domain name format")
+		panic(getDomainNamePanicMessage(name))

@@ -913,0 +914,4 @@
+// getDomainNamePanicMessage returns panic message for invalid domain name containing
+// mentioned domain name
+func getDomainNamePanicMessage(name string) string {
+	msg := "invalid domain name format: '" + name + "'"

@@ -739,0 +724,4 @@
+func checkDomainNameLength(name string) {
+	l := len(name)
+	if l > maxDomainNameLength {
+		panic(getDomainNamePanicMessage(name, "domain name too long: got = "+std.Itoa(len(name), 10)+", max = "+std.Itoa(maxDomainNameLength, 10)))

@@ -739,0 +727,4 @@
+		panic(getDomainNamePanicMessage(name, "domain name too long: got = "+std.Itoa(len(name), 10)+", max = "+std.Itoa(maxDomainNameLength, 10)))
+	}
+	if l < minDomainNameLength {
+		panic(getDomainNamePanicMessage(name, "domain name too short: got = "+std.Itoa(len(name), 10)+", min = "+std.Itoa(minDomainNameLength, 10)))

@@ -913,0 +905,4 @@
+
+// getDomainNamePanicMessage returns panic message for invalid domain name containing
+// mentioned domain name
+func getDomainNamePanicMessage(name string, problem string) string {