Kafka start timeout should be configurable

[antban]

Right now on kafka start bubuku tries to do next steps:

1. Start kafka process
2. Wait for broker id to be available in zk in WAIT_TIMEOUT seconds
3. Of it is not there within timeout:

• increase WAIT_TIMEOUT by 60 seconds
• forcibly stop running kafka process
• start from 1

Initial wait timeout is 300 seconds, but for some environments it should be significantly bigger (30 minutes, for example), or step of increase must be progressive.