DATACASS-331 - Polishing.

Fix logger dependency. Fix flakey async test.

spring-cql/pom.xml

@@ -87,6 +87,10 @@
 					<artifactId>slf4j-log4j12</artifactId>
 					<groupId>org.slf4j</groupId>
 				</exclusion>
+				<exclusion>
+					<groupId>ch.qos.logback</groupId>
+					<artifactId>logback-core</artifactId>
+				</exclusion>
 				<exclusion>
 					<artifactId>guava</artifactId>
 					<groupId>com.google.guava</groupId>