IT and Chaos Monkey improvements

While running the IntegrationTestIngest with slowDeterministic chaos monkey in our environment, we faced some issues with some of the chaos actions that required run some linux shell commands, due to the way we set hbase environment variables and start/stop scripts.

This patch allows for defining extensions of HBaseShellCommandProvider in the configuration, so that custom commands can be used. It also extends SlowDeterministicMonkeyFactory to provide the ability to configure the destructive actions to be executed.