show more info for nodes

[Omarabdul3ziz]

Is your feature request related to a problem? Please describe

it is needed from the dashboard to view extra node info like:

• network speed (download/upload)
• dmi data

Describe the solution you'd like

• get dmi data for each node from zos.system.dmi rmb call
• get speed data either from zos.system.diagnostics or zos.perf.get(network) calls

[Omarabdul3ziz]

update: (wip)

• merged the indexer to be in a single package
• used a single rmb client across all the proxy
• introducing dmi watcher

[Omarabdul3ziz]

update: (work is done)

• description & changes on the pr description https://github.com/threefoldtech/tfgrid-sdk-go/pull/726