[db] Remove TestPlan.owner field, duplicates TestPlan.author

[atodorov]

No description provided.

[codecov-io]

Codecov Report

Merging #641 into master will increase coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #641      +/-   ##
=========================================
+ Coverage   64.37%   64.4%   +0.02%     
=========================================
  Files         110     110              
  Lines        6221    6208      -13     
  Branches      831     829       -2     
=========================================
- Hits         4005    3998       -7     
+ Misses       1955    1950       -5     
+ Partials      261     260       -1

Impacted Files	Coverage Δ
tcms/core/views.py	85.71% <ø> (ø)	⬆️
tcms/testplans/views.py	59.45% <ø> (+0.39%)	⬆️
tcms/tests/factories.py	87.14% <ø> (-0.07%)	⬇️
tcms/testplans/forms.py	86.04% <ø> (-0.63%)	⬇️
tcms/search/order.py	43.75% <ø> (ø)	⬆️
tcms/xmlrpc/api/testplan.py	57.5% <ø> (+1.4%)	⬆️
tcms/testplans/models.py	71.42% <ø> (-0.43%)	⬇️
tcms/xmlrpc/serializer.py	82.45% <ø> (ø)	⬆️
tcms/testplans/helpers/email.py	0% <0%> (ø)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 2072

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 64.154%

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Totals
Change from base Build 2070:	0.02%
Covered Lines:	4256
Relevant Lines:	6208

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💛 - Coveralls