Refactoring of the node monitoring flows into node agent.

[anmolbabu]

The present day node-monitoring contains the following:

• The collectd custom plugins(majority being sds-specific)
• Jinja2 templates for configuring the collectd plugins
• A generic flow and a python script(that can be used as a linux command) to get the configs generated from jinja templates given the appropriate parameters.

To be removed:

• A python script that pushes collectd detected threshold alert to etcd.

The idea behind a specification for this is to merge node-monitoring and node-agent.

Challenges In consolidating the node-monitoring and node-agent services:

• Packaging the sds-specific plugins and templates: If they are moved out to sds-integrations, then who takes the responsibility of running the generic configuration flow?? Will the flows for even sds configuration still be in node-agent and executed by node-agent itself??

[anmolbabu]

Closing this as it is implemented by https://github.com/Tendrl/node-agent/pull/555