Harvest should collect and display Flexgroup Informations

[Sandromuc]

Is your feature request related to a problem? Please describe.
Flexgroups are already shown in Volume Dashboard

Describe the solution you'd like
Information about constituent volumes and aggregate list are missing.

Describe alternatives you've considered
Alternatively a new Dashboard only for Flexgroups

[ewilts]

To add to the original comments:
The newly added (thanks!) "Top Volume FabricPool" is ignoring all of the FlexGroup constituents. When aggregates get full, we also consider the FG constituents when deciding what volumes to move around so it's important that they get included too. On the first aggregate I checked, 3 of the top 5 volumes by performance tier utilization are FG constituents yet were not listed on the dashboard. And now that I look around some more, there appears to be almost no support for FlexGroup constituents in the Volume dashboard at all.

I can see that implementing support for flexgroups is non-trivial - there are times I just want the overall FG data but other times I want it broken down by constituent like I described above, even for the same graph (latency, throughput, IOPS, etc.)

[rahulguptajss]

verified in main