TST: stats: bump test tolerance in TestMultivariateNormal.test_broadcasting
TST: stats: bump test tolerance in TestMultivariateNormal.test_broadcasting

The multivariate computations use a randomized algorithm, so the outputs
vary. The test with the previous tolerance appears to fail on all
platforms if iterated several times -- and also failed on windows on the
first round. Bump the tolerance to a value where the failures become
less likely.

Also move comparison values out from the loop.

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