Update install script

[wtgee]

• Install supervisor and use instead of systemd so panoptes user has better control of config file and control.
• Use htpdate instead of ntpdate and use google.com as the time server.
• Remove docker items.
• Install pocs from local repo.
• Remove unused nfs setup.

Comes from #1167
Replaces and closes #1166

[codecov]

Codecov Report

Merging #1176 (1aa1b73) into develop (4908119) will decrease coverage by 8.27%.
The diff coverage is 60.76%.

@@             Coverage Diff             @@
##           develop    #1176      +/-   ##
===========================================
- Coverage    83.08%   74.80%   -8.28%     
===========================================
  Files           86       91       +5     
  Lines         7425     7848     +423     
  Branches       635      877     +242     
===========================================
- Hits          6169     5871     -298     
- Misses        1083     1834     +751     
+ Partials       173      143      -30     

Impacted Files	Coverage Δ
src/panoptes/pocs/camera/gphoto/remote.py	0.00% <0.00%> (-21.57%)	⬇️
src/panoptes/pocs/sensor/power.py	40.23% <0.00%> (-1.74%)	⬇️
...rc/panoptes/pocs/state/states/default/analyzing.py	5.55% <0.00%> (-54.45%)	⬇️
...rc/panoptes/pocs/state/states/default/observing.py	13.33% <0.00%> (-62.86%)	⬇️
src/panoptes/pocs/state/states/default/tracking.py	6.66% <0.00%> (-76.67%)	⬇️
src/panoptes/pocs/utils/cli/main.py	0.00% <0.00%> (-70.00%)	⬇️
src/panoptes/pocs/utils/database.py	0.00% <0.00%> (ø)
src/panoptes/pocs/utils/logger.py	100.00% <ø> (ø)
tests/test_ioptron.py	66.66% <0.00%> (+0.70%)	⬆️
src/panoptes/pocs/utils/cli/image.py	33.33% <33.33%> (ø)
... and 70 more

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