Remove useless `test_supports_primary_key`
Remove useless `test_supports_primary_key`

`supports_primary_key?` method is defined in `AbstractAdapter` so does
not raise any errors.

kaspth/rails,samphilipd/rails,richseviora/rails,pschambacher/rails,EmmaB/rails-1,yhirano55/rails,palkan/rails,MSP-Greg/rails,shioyama/rails,voray/rails,tjschuck/rails,mathieujobin/reduced-rails-for-travis,BlakeWilliams/rails,eileencodes/rails,ngpestelos/rails,betesh/rails,bradleypriest/rails,mijoharas/rails,mohitnatoo/rails,alecspopa/rails,lucasmazza/rails,gauravtiwari/rails,betesh/rails,fabianoleittes/rails,georgeclaghorn/rails,gavingmiller/rails,schuetzm/rails,yahonda/rails,starknx/rails,untidy-hair/rails,mijoharas/rails,Vasfed/rails,xlymian/rails,bolek/rails,arunagw/rails,arunagw/rails,starknx/rails,kddeisz/rails,rails/rails,mtsmfm/railstest,illacceptanything/illacceptanything,printercu/rails,rails/rails,assain/rails,pschambacher/rails,kddeisz/rails,yhirano55/rails,notapatch/rails,rbhitchcock/rails,joonyou/rails,Vasfed/rails,coreyward/rails,aditya-kapoor/rails,notapatch/rails,illacceptanything/illacceptanything,rafaelfranca/omg-rails,shioyama/rails,yawboakye/rails,Spin42/rails,gauravtiwari/rails,gavingmiller/rails,felipecvo/rails,MSP-Greg/rails,tgxworld/rails,betesh/rails,Vasfed/rails,Vasfed/rails,rafaelfranca/omg-rails,samphilipd/rails,kirs/rails-1,koic/rails,Spin42/rails,Stellenticket/rails,yalab/rails,illacceptanything/illacceptanything,deraru/rails,illacceptanything/illacceptanything,kmayer/rails,iainbeeston/rails,kamipo/rails,gcourtemanche/rails,shioyama/rails,riseshia/railsguides.kr,iainbeeston/rails,lucasmazza/rails,illacceptanything/illacceptanything,hanystudy/rails,Sen-Zhang/rails,baerjam/rails,elfassy/rails,aditya-kapoor/rails,ttanimichi/rails,travisofthenorth/rails,fabianoleittes/rails,MSP-Greg/rails,xlymian/rails,mohitnatoo/rails,yalab/rails,yawboakye/rails,gcourtemanche/rails,marklocklear/rails,Envek/rails,schuetzm/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,mtsmfm/rails,coreyward/rails,bradleypriest/rails,kmayer/rails,Erol/rails,palkan/rails,travisofthenorth/rails,yasslab/railsguides.jp,Erol/rails,prathamesh-sonpatki/rails,ngpestelos/rails,iainbeeston/rails,deraru/rails,yahonda/rails,mohitnatoo/rails,tgxworld/rails,koic/rails,printercu/rails,georgeclaghorn/rails,richseviora/rails,utilum/rails,illacceptanything/illacceptanything,Stellenticket/rails,gavingmiller/rails,georgeclaghorn/rails,mtsmfm/railstest,riseshia/railsguides.kr,baerjam/rails,utilum/rails,kaspth/rails,matrinox/rails,aditya-kapoor/rails,flanger001/rails,kirs/rails-1,bogdanvlviv/rails,kenta-s/rails,assain/rails,aditya-kapoor/rails,illacceptanything/illacceptanything,matrinox/rails,starknx/rails,yawboakye/rails,printercu/rails,palkan/rails,bogdanvlviv/rails,kddeisz/rails,pvalena/rails,matrinox/rails,eileencodes/rails,riseshia/railsguides.kr,travisofthenorth/rails,voray/rails,baerjam/rails,joonyou/rails,pvalena/rails,odedniv/rails,gauravtiwari/rails,kamipo/rails,Erol/rails,schuetzm/rails,arunagw/rails,yhirano55/rails,Edouard-chin/rails,lcreid/rails,assain/rails,odedniv/rails,kmayer/rails,fabianoleittes/rails,utilum/rails,joonyou/rails,deraru/rails,arunagw/rails,illacceptanything/illacceptanything,voray/rails,pvalena/rails,kmcphillips/rails,ttanimichi/rails,mechanicles/rails,mtsmfm/railstest,samphilipd/rails,utilum/rails,schuetzm/rails,riseshia/railsguides.kr,flanger001/rails,bolek/rails,yalab/rails,notapatch/rails,ledestin/rails,BlakeWilliams/rails,mechanicles/rails,tgxworld/rails,vipulnsward/rails,Sen-Zhang/rails,alecspopa/rails,Stellenticket/rails,fabianoleittes/rails,illacceptanything/illacceptanything,alecspopa/rails,yasslab/railsguides.jp,mijoharas/rails,maicher/rails,lcreid/rails,pvalena/rails,Envek/rails,yalab/rails,yasslab/railsguides.jp,felipecvo/rails,repinel/rails,untidy-hair/rails,ledestin/rails,vipulnsward/rails,hanystudy/rails,joonyou/rails,yahonda/rails,gfvcastro/rails,tjschuck/rails,xlymian/rails,EmmaB/rails-1,shioyama/rails,gcourtemanche/rails,betesh/rails,rbhitchcock/rails,gfvcastro/rails,Erol/rails,rails/rails,maicher/rails,kddeisz/rails,esparta/rails,tgxworld/rails,jeremy/rails,jeremy/rails,marklocklear/rails,brchristian/rails,Edouard-chin/rails,kamipo/rails,koic/rails,bogdanvlviv/rails,mtsmfm/rails,ttanimichi/rails,assain/rails,prathamesh-sonpatki/rails,vipulnsward/rails,kaspth/rails,printercu/rails,mechanicles/rails,bogdanvlviv/rails,Envek/rails,mechanicles/rails,Stellenticket/rails,yhirano55/rails,flanger001/rails,illacceptanything/illacceptanything,richseviora/rails,palkan/rails,esparta/rails,brchristian/rails,ledestin/rails,BlakeWilliams/rails,repinel/rails,lcreid/rails,gfvcastro/rails,esparta/rails,marklocklear/rails,gfvcastro/rails,MSP-Greg/rails,felipecvo/rails,georgeclaghorn/rails,flanger001/rails,bradleypriest/rails,rossta/rails,prathamesh-sonpatki/rails,rbhitchcock/rails,untidy-hair/rails,jeremy/rails,mathieujobin/reduced-rails-for-travis,pschambacher/rails,kirs/rails-1,Envek/rails,illacceptanything/illacceptanything,hanystudy/rails,baerjam/rails,Sen-Zhang/rails,coreyward/rails,rails/rails,odedniv/rails,Spin42/rails,BlakeWilliams/rails,repinel/rails,illacceptanythin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