Add a jvm option to choose which jvm will run Cassandra

[Kiiv]

Hi,

I have followed the example suggesting to use the toolchain and the jvm option of failsafe plugin to change the jvm between test execution and server start. There is two thing that i found not optimal :

• this implies to change the jvm for all the pre-integration-test phase
• this rely on a functionality of an other plugin (jvm option of the failsafe plugin)

It seems to me that adding a jvm option as well in the cassandra-maven-plugin should do a better job.