ISPN-4231 DistSyncL1FuncTest.testRemoteGetArrivesButWriteOccursBeforeRegistration random failures

https://issues.jboss.org/browse/ISPN-4231
https://issues.jboss.org/browse/ISPN-4133

Restart the cache after each method, to prevent commands from the previous
test method from interfering.

Should also fix ISPN-4133 DistSyncL1FuncTest.testNonOwnerRetrievesValueFromBackupOwnerWhileWrite