refactor forms.py to reduce duplication

[rloomans]

No description provided.

[coveralls]

Coverage increased (+1.7%) to 75.643% when pulling 7eba00d on cleanups into 78210e8 on master.

[codecov]

Codecov Report

Merging #31 into master will increase coverage by 2.82%.
The diff coverage is 76%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   67.66%   70.49%   +2.82%     
==========================================
  Files          12       12              
  Lines        1302     1237      -65     
  Branches      208      173      -35     
==========================================
- Hits          881      872       -9     
+ Misses        339      296      -43     
+ Partials       82       69      -13

Impacted Files	Coverage Δ
teamtemp/responses/models.py	94.02% <100%> (ø)	⬆️
teamtemp/responses/forms.py	83.67% <75.51%> (+17.38%)	⬆️

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[coveralls]

Coverage increased (+2.1%) to 76.071% when pulling 4bda0ee on cleanups into 78210e8 on master.

[coveralls]

Coverage increased (+2.1%) to 76.071% when pulling 4bda0ee on cleanups into 78210e8 on master.