Add category for integration tests with real clusters and optimize the test execution on appveyor

Description

Some tests are necessary in Windows but those shouldn't require a real Cassandra cluster. Removing these from Appveyor would greatly reduce build times.

UPDATE: one job will still execute the full test suite against net452 target but some tests need to be converted to simulacron in order to keep the length under 1 hour.

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Reporter

Joao Reis

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