Enables

Make optional "enable" flags use common names and form.

Flags for:
* NODE_MONITORING (run cadvisor) @vmarmol 
* CLUSTER_MONITORING (run heapster) @vishh 
* NODE_LOGGING (run fluentd) @satnam6502 

Is there a flag to run elasticsearch and kibana at cluster boot time? @satnam6502 

This can be subtle - please review commit-by-commit and carefully.