TST: Fix warning errors in fitckap2 tests
TST: Fix warning errors in fitckap2 tests

These could also be handled by assert_warns, just went for the
suppression context manager here anyway, maybe not as nice.

The are warnings that were shown only in python 3.

gertingold/scipy,jamestwebber/scipy,person142/scipy,ilayn/scipy,vigna/scipy,lhilt/scipy,matthew-brett/scipy,andyfaff/scipy,e-q/scipy,person142/scipy,aarchiba/scipy,andyfaff/scipy,vigna/scipy,lhilt/scipy,e-q/scipy,Stefan-Endres/scipy,aeklant/scipy,anntzer/scipy,gfyoung/scipy,gfyoung/scipy,person142/scipy,jamestwebber/scipy,Eric89GXL/scipy,arokem/scipy,Stefan-Endres/scipy,mdhaber/scipy,grlee77/scipy,Stefan-Endres/scipy,ilayn/scipy,jor-/scipy,scipy/scipy,lhilt/scipy,WarrenWeckesser/scipy,matthew-brett/scipy,rgommers/scipy,zerothi/scipy,endolith/scipy,tylerjereddy/scipy,aeklant/scipy,Eric89GXL/scipy,nmayorov/scipy,Stefan-Endres/scipy,arokem/scipy,scipy/scipy,tylerjereddy/scipy,ilayn/scipy,zerothi/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,andyfaff/scipy,rgommers/scipy,apbard/scipy,gertingold/scipy,aeklant/scipy,e-q/scipy,matthew-brett/scipy,gfyoung/scipy,nmayorov/scipy,grlee77/scipy,scipy/scipy,aeklant/scipy,WarrenWeckesser/scipy,jamestwebber/scipy,jor-/scipy,grlee77/scipy,person142/scipy,lhilt/scipy,vigna/scipy,jor-/scipy,endolith/scipy,endolith/scipy,gertingold/scipy,WarrenWeckesser/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,vigna/scipy,jamestwebber/scipy,scipy/scipy,Eric89GXL/scipy,mdhaber/scipy,zerothi/scipy,Eric89GXL/scipy,scipy/scipy,ilayn/scipy,gfyoung/scipy,perimosocordiae/scipy,ilayn/scipy,pizzathief/scipy,lhilt/scipy,aarchiba/scipy,scipy/scipy,gertingold/scipy,anntzer/scipy,perimosocordiae/scipy,zerothi/scipy,Eric89GXL/scipy,tylerjereddy/scipy,endolith/scipy,anntzer/scipy,anntzer/scipy,grlee77/scipy,grlee77/scipy,andyfaff/scipy,WarrenWeckesser/scipy,anntzer/scipy,tylerjereddy/scipy,mdhaber/scipy,arokem/scipy,andyfaff/scipy,pizzathief/scipy,apbard/scipy,pizzathief/scipy,ilayn/scipy,aeklant/scipy,perimosocordiae/scipy,nmayorov/scipy,mdhaber/scipy,endolith/scipy,aarchiba/scipy,e-q/scipy,mdhaber/scipy,rgommers/scipy,aarchiba/scipy,apbard/scipy,andyfaff/scipy,arokem/scipy,WarrenWeckesser/scipy,nmayorov/scipy,jor-/scipy,apbard/scipy,Eric89GXL/scipy,anntzer/scipy,jor-/scipy,gfyoung/scipy,gertingold/scipy,matthew-brett/scipy,perimosocordiae/scipy,tylerjereddy/scipy,e-q/scipy,pizzathief/scipy,Stefan-Endres/scipy,zerothi/scipy,pizzathief/scipy,perimosocordiae/scipy,aarchiba/scipy,jamestwebber/scipy,vigna/scipy,rgommers/scipy,matthew-brett/scipy,apbard/scipy,person142/scipy,arokem/scipy,zerothi/scipy,rgommers/scipy,nmayorov/scipy