cleanup travis logic from tests fixtures

[codecov-commenter]

Codecov Report

Merging #985 into master will decrease coverage by 0.3%. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #985     +/-   ##
========================================
- Coverage    94.6%   94.4%   -0.2%     
========================================
  Files         316     316             
  Lines       28047   28047             
========================================
- Hits        26518   26456     -62     
- Misses       1529    1591     +62     

Impacted Files	Coverage Δ
guillotina/db/storages/dummy.py	62.3% <0.0%> (-31.7%)	:arrow_down:
guillotina/db/factory.py	85.5% <0.0%> (-7.5%)	:arrow_down:

[lferran]

@masipcat this blocked because it has a decrease of coverage, but I'd say it's worth merging anyway right?