Provide dependency management for Cassandra Driver

This commit adds dependency management for Cassandra Driver’s three
modules. The version is the latest maintenance release of the minor version that’s used by Spring Data Cassandra in the Spring Data Gosling release train.

Closes gh-4167

spring-boot-dependencies/pom.xml

@@ -52,6 +52,7 @@
 		<aspectj.version>1.8.7</aspectj.version>
 		<atomikos.version>3.9.3</atomikos.version>
 		<bitronix.version>2.1.4</bitronix.version>
+		<cassandra-driver.version>2.1.8</cassandra-driver.version>
 		<commons-beanutils.version>1.9.2</commons-beanutils.version>
 		<commons-collections.version>3.2.1</commons-collections.version>
 		<commons-dbcp.version>1.4</commons-dbcp.version>
@@ -497,6 +498,21 @@
 				<artifactId>transactions-jta</artifactId>
 				<version>${atomikos.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>com.datastax.cassandra</groupId>
+				<artifactId>cassandra-driver-core</artifactId>
+				<version>${cassandra-driver.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>com.datastax.cassandra</groupId>
+				<artifactId>cassandra-driver-dse</artifactId>
+				<version>${cassandra-driver.version}</version>
+			</dependency>
+			<dependency>
+				<groupId>com.datastax.cassandra</groupId>
+				<artifactId>cassandra-driver-mapping</artifactId>
+				<version>${cassandra-driver.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>com.fasterxml.jackson.core</groupId>
 				<artifactId>jackson-annotations</artifactId>