ISPN-4504 Topology id is not properly set on ClusteredGetCommands

ClusteredGetCommand should NOT be topology-aware
ISPN-4503 Commands with topology id 0 are not properly ignored on joiners
ISPN-2522 The StateTransferCacheLoaderFunctionalTest (StateTransferFunctionTest) tests fail periodically

* Disable synchronizations, so that commit failures are not ignored.
* Pause between writes so that the writing thread doesn't hog all
  the CPU before the 2nd node joins.
* Fail-fast in StateTransferLargeObjectTest
ISPN-4522 Test for HR PLAIN auth against LDAP
A more sensible null check
Remove usages of deprecated SearchManager.getQueryFactory()
ISPN-4464 Unify test suite for remote and embedded DSL based query tests

Remote and embedded DSL query tests share the domain model. The model defines interfaces
that are implemented using Hibernate Search anontated entities for embedded mode and
Protobuf entities for remote mode. The test driver code is shared between embedded
and remote tests.