Add more info to 'eli describe device <name>'

[ernoaapa]

Added filesystem and uptime information to eli describe device command.

Also under the hood renamed concept of Device to Node because in future we want to call attached devices as "devices" and follow same naming convention as Kubernetes about the actual device where containers run, as "nodes".

[codecov[bot]]

Codecov Report

Merging #33 into master will increase coverage by 4.02%. The diff coverage is 66.06%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   19.94%   23.97%   +4.02%     
==========================================
  Files          49       50       +1     
  Lines        2346     2419      +73     
==========================================
+ Hits          468      580     +112     
+ Misses       1825     1775      -50     
- Partials       53       64      +11

Impacted Files	Coverage Δ
pkg/discovery/client.go	0% <0%> (ø)	:arrow_up:
cmd/utils.go	35.47% <0%> (ø)	:arrow_up:
pkg/api/server.go	2.2% <0%> (ø)	:arrow_up:
pkg/api/client.go	0% <0%> (ø)	:arrow_up:
pkg/discovery/mapping.go	100% <100%> (ø)	:arrow_up:
pkg/node/resolver.go	69.38% <100%> (ø)
pkg/printers/yaml.go	44.82% <33.33%> (ø)	:arrow_up:
pkg/node/utils.go	66.66% <66.66%> (ø)
pkg/printers/humanreadable.go	54.83% <84.84%> (+11.98%)	:arrow_up:
pkg/node/resolver_linux.go	87.5% <87.5%> (ø)
... and 3 more

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