parse: Prefer strain over name as sequence ID field

[victorlin]

Description of proposed changes

Following through with deprecation.

Related issue(s)

• Follow-up to Add a parameter to augur parse to specify a different record ID for output sequences FASTA #1403

Checklist

• Automated checks pass
• Check if you need to add a changelog message
• Check if you need to add tests
• Check if you need to update docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.06%. Comparing base (db54927) to head (5e0bc54).
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1629   +/-   ##
=======================================
  Coverage   71.06%   71.06%           
=======================================
  Files          79       79           
  Lines        8268     8268           
  Branches     2010     2009    -1     
=======================================
  Hits         5876     5876           
  Misses       2101     2101           
  Partials      291      291           

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