4.x: PreparedStatementCancellationIT.will_cache_invalid_cql can fial

[dkropachev]

Failure:

Error:  com.datastax.oss.driver.core.cql.PreparedStatementCancellationIT.will_cache_invalid_cql  Time elapsed: 6.654 s  <<< FAILURE!
org.junit.ComparisonFailure: expected:<[1]L> but was:<[0]L>
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at com.datastax.oss.driver.core.cql.PreparedStatementCancellationIT.will_cache_invalid_cql(PreparedStatementCancellationIT.java:137)