pkg/kubelet/userns: Remove outdated test

When we were alocating the whole UID space, the first range was reserved
to the host. Now we don't allocate the whole UID space, but just the
range configured, so the first range doesn't point to [0;65535] anymore,
so no need to test it is always set.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>

pkg/kubelet/userns/userns_manager_test.go

@@ -79,8 +79,6 @@ func TestUserNsManagerAllocate(t *testing.T) {
 	m, err := MakeUserNsManager(testUserNsPodsManager)
 	require.NoError(t, err)
 
-	assert.Equal(t, true, m.isSet(0*65536), "m.isSet(0) should be true")
-
 	allocated, length, err := m.allocateOne("one")
 	assert.NoError(t, err)
 	assert.Equal(t, userNsLength, int(length), "m.isSet(%d).length=%v", allocated, length)