[Doc] Configuring a JDBC persistence store in Fuse MQ Enterprise needs to be documented

The current Fuse MQ Enterprise documentation doe not point out that the org.apache.servicemix.bundles.commons-dbcp bundle or the database driver need to be installed into the container in order to configure a JDBC persistence store [1].

[1] https://access.redhat.com/knowledge/docs/en-US/Fuse_MQ_Enterprise/7.1/html/Configuring_Broker_Persistence/files/FuseMBPersistJDBCBasics.html

The documentation also mentions example configuration of various JDBC configurations in InstallDir/conf/activemq-jdbc.xml which does not exist in Fuse MQ Enterprise.

The org.apache.servicemix.bundles.commons-dbcp bundle can be installed as follows:

osgi:install mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.commons-dbcp/1.4_3

Then the database driver can be installed as follows (Example using MySQL driver):

osgi:install wrap:file:/Users/jsherman/Development/jdbc/driver/mysql-connector-java-5.1.18/mysql-connector-java-5.1.18-bin.jar