Re-add kernel Flavor tests

Docker-DCO-1.1-Signed-off-by: Charles Lindsay <chaz@chazomatic.us> (github: chazomaticus)

utils/utils_test.go

@@ -407,14 +407,17 @@ func assertParseRelease(t *testing.T, release string, b *KernelVersionInfo, resu
 	if r := CompareKernelVersion(a, b); r != result {
 		t.Fatalf("Unexpected kernel version comparison result. Found %d, expected %d", r, result)
 	}
+	if a.Flavor != b.Flavor {
+		t.Fatalf("Unexpected parsed kernel flavor.  Found %s, expected %s", a.Flavor, b.Flavor)
+	}
 }
 
 func TestParseRelease(t *testing.T) {
 	assertParseRelease(t, "3.8.0", &KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}, 0)
-	assertParseRelease(t, "3.4.54.longterm-1", &KernelVersionInfo{Kernel: 3, Major: 4, Minor: 54}, 0)
-	assertParseRelease(t, "3.4.54.longterm-1", &KernelVersionInfo{Kernel: 3, Major: 4, Minor: 54}, 0)
-	assertParseRelease(t, "3.8.0-19-generic", &KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}, 0)
-	assertParseRelease(t, "3.12.8tag", &KernelVersionInfo{Kernel: 3, Major: 12, Minor: 8}, 0)
+	assertParseRelease(t, "3.4.54.longterm-1", &KernelVersionInfo{Kernel: 3, Major: 4, Minor: 54, Flavor: ".longterm-1"}, 0)
+	assertParseRelease(t, "3.4.54.longterm-1", &KernelVersionInfo{Kernel: 3, Major: 4, Minor: 54, Flavor: ".longterm-1"}, 0)
+	assertParseRelease(t, "3.8.0-19-generic", &KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0, Flavor: "-19-generic"}, 0)
+	assertParseRelease(t, "3.12.8tag", &KernelVersionInfo{Kernel: 3, Major: 12, Minor: 8, Flavor: "tag"}, 0)
 }
 
 func TestParsePortMapping(t *testing.T) {