Add failing test for odd kernel version

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

utils/utils_test.go

@@ -414,6 +414,7 @@ func TestParseRelease(t *testing.T) {
 	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, Flavor: "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) {