Small metadata and camera improvements

[wtgee]

• Updating current metadata record should clobber, not merge.
• Changing gphoto2 log entry to a warning.
• Try to get camera model.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 70.22%. Comparing base (e0bb372) to head (ff34248).

❗ Current head ff34248 differs from pull request most recent head 737ffe0. Consider uploading reports for the commit 737ffe0 to get more accurate results

Files	Patch %	Lines
src/panoptes/pocs/utils/cli/network.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1253   +/-   ##
========================================
  Coverage    70.22%   70.22%           
========================================
  Files          100      100           
  Lines         8399     8399           
  Branches      1164     1164           
========================================
  Hits          5898     5898           
  Misses        2352     2352           
  Partials       149      149           

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