Removal of a broken CTS test

The cause of the failure is that the test asserts that the
entrySet() Set from an UnmodifiableMap is Serializable,
when it is not.

The test fails under the RI as well so I have removed it.

Bug: 11668227
Change-Id: Ife3ce848f77d6f63931852792e0f6f0db83382a8
1 file changed