[RFE] Monitor tendrl server node -- etcd, graphite etc.. performance

[anmolbabu]

1. Currently only nodes of the cluster imported in tendrl are monitored(configured for monitoring) by tendrl's collectd plugins
2. The tendrl server node needs to be monitored for performance aspects of server node components of tendrl stack like etcd and graphite along with the other attributes like storage, disk attributes, memory, cpu, network and swap

[anmolbabu]

Cc: @Tendrl/tendrl-core