MAINT: sparse: speed up setdiag tests
MAINT: sparse: speed up setdiag tests

Splits the quick tests out into a separate method,
and reduces the search space of the comprehensive test.

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