Allow to modify liveness and readiness probes

[cscetbon]

Probes are automatically defined and configure to use

• https://github.com/Orange-OpenSource/casskop/blob/v0.5.0-release/docker/bootstrap/files/liveness-probe.sh
• https://github.com/Orange-OpenSource/casskop/blob/v0.5.0-release/docker/bootstrap/files/ready-probe.sh.

Parameters are also hardcoded https://github.com/Orange-OpenSource/casskop/blob/v0.5.0-release/pkg/controller/cassandracluster/generator.go#L52-L58.

All this should be made configurable

[cscetbon]

PR #184 improves those two default probes using Jolokia calls instead of nodetool commands.

[erdrix]

Are the PR #201 and PR #206 enough to close this issue ?

[cscetbon]

I think so. Closing it