Replace uuid dependency with internal library

Signed-off-by: Stephen J Day <stephen.day@docker.com>

uuid/uuid_test.go

@@ -0,0 +1,48 @@
+package uuid
+
+import (
+	"testing"
+)
+
+const iterations = 1000
+
+func TestUUID4Generation(t *testing.T) {
+	for i := 0; i < iterations; i++ {
+		u := Generate()
+
+		if u[6]&0xf0 != 0x40 {
+			t.Fatalf("version byte not correctly set: %v, %08b %08b", u, u[6], u[6]&0xf0)
+		}
+
+		if u[8]&0xc0 != 0x80 {
+			t.Fatalf("top order 8th byte not correctly set: %v, %b", u, u[8])
+		}
+	}
+}
+
+func TestParseAndEquality(t *testing.T) {
+	for i := 0; i < iterations; i++ {
+		u := Generate()
+
+		parsed, err := Parse(u.String())
+		if err != nil {
+			t.Fatalf("error parsing uuid %v: %v", u, err)
+		}
+
+		if parsed != u {
+			t.Fatalf("parsing round trip failed: %v != %v", parsed, u)
+		}
+	}
+
+	for _, c := range []string{
+		"bad",
+		"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",    // correct length, incorrect format
+		"  20cc7775-2671-43c7-8742-51d1cfa23258",  // leading space
+		"20cc7775-2671-43c7-8742-51d1cfa23258   ", // trailing space
+		"00000000-0000-0000-0000-x00000000000   ", // out of range character
+	} {
+		if _, err := Parse(c); err == nil {
+			t.Fatalf("parsing %q should have failed", c)
+		}
+	}
+}