Fix test failure on TestPoint#testEqualsAndHashCode

[easyice]

If two objects are different, it might have the same hashcode. in this case, Point(-180.0,90.0) and Point(180.0,-90.0) will have the same hashcode value.

org.apache.lucene.geo.TestPoint > testEqualsAndHashCode FAILED
    java.lang.AssertionError: Values should be different. Actual: -1965031424
        at __randomizedtesting.SeedInfo.seed([ADA73B977A63C061:DE69C35A79C6BF50]:0)
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failEquals(Assert.java:187)
        at org.junit.Assert.assertNotEquals(Assert.java:201)
        at org.junit.Assert.assertNotEquals(Assert.java:213)
        at org.apache.lucene.geo.TestPoint.testEqualsAndHashCode(TestPoint.java:59)

./gradlew :lucene:core:test --tests "org.apache.lucene.geo.TestPoint.testEqualsAndHashCode"  -Ptests.seed=ADA73B977A63C061

We had similar issues in the other tests like TestCircle#testEqualsAndHashCode, TestXYPolygon#testEqualsAndHashCode. it seems it also needs to be removed. for random values, the hash code must be different is a wrong assumption.

[easyice]

Maybe we don't need to fix the other tests right now, unless they really encounter hash collisions.

[mikemccand]

Thanks @easyice -- this is indeed the wrong assumption. Different (.equals() == false) objects are indeed allowed to have the same hash code.

[easyice]

Thanks for reviewing, Mike!