Ignore failing IT in 4.x-cdh branch

A few tests are failing on 4.x-cdh branch. This ticket if for bringing the branch back into a building status and also to act as an umbrella to track further work on reenabling this tests.

Also IT parallelism has been reduced to 4.

Four tests below are failing when building via Maven. Some of them work fine when run independently.

phoenix-core/src/it/java/org/apache/phoenix/end2end/LocalIndexSplitMergeIT.java
phoenix-core/src/it/java/org/apache/phoenix/end2end/TableSnapshotReadsMapReduceIT.java
phoenix-core/src/it/java/org/apache/phoenix/end2end/ViewIT.java
phoenix-core/src/it/java/org/apache/phoenix/end2end/index/MutableIndexIT.java