Code cleanup.

AssuredReplicationServerTest.java:
Added SafeReadAssertions with sensible defaults to allow for fluent style assertions on of the FakeReplicationDomain stats.
In checkTimeAndMonitoringSafeData(), extracted methods checkAckOccured() and checkTimeOutOccured().
Used assertj SoftAssertions for blocks of asserts.
In checkServerErrors(), used assertj Assertions.assertThat()
Removed checkServerErrorListsAreEqual() superseded by assertj Assertions.assertThat(Map).