On deleting a resource there is a need to update graphite data

[rishubhjain]

With reference to #357 and Tendrl/specifications#249 there is a need for gluster-integration to call a Monitoring-integration flow when a resource is deleted so as to remove/update resource details(metrics) on graphite.

[rishubhjain]

@anmolbabu @r0h4n @shtripat

[rishubhjain]

Possible cases:

1. When Volume is deleted
   Required details: i) Cluster id
   ii) volume_name (preferable) or volume_id
2. When Brick is deleted
   Required details: i) Cluster id
   ii) volume_name (preferable) or volume_id
   iii) Node name (preferable) or node_id
3. When Node is deleted
   When the complete volume is deleted which depends on that node
   Required details: i) Cluster id
   ii) volume_name (preferable) or volume_id
   iii) Node name (preferable) or node_id

@nnDarshan Please have a look