tests: runner: do recursive remove on tmp
tests: runner: do recursive remove on tmp

do recursive remove on tmp so we can have sub directories for readdir
test.

zhaozg/luvit,rjeli/luvit,boundary/luvit,sousoux/luvit,boundary/luvit,boundary/luvit,GabrielNicolasAvellaneda/luvit-upstream,boundary/luvit,rjeli/luvit,sousoux/luvit,DBarney/luvit,luvit/luvit,bsn069/luvit,AndrewTsao/luvit,luvit/luvit,boundary/luvit,DBarney/luvit,sousoux/luvit,GabrielNicolasAvellaneda/luvit-upstream,GabrielNicolasAvellaneda/luvit-upstream,AndrewTsao/luvit,DBarney/luvit,connectFree/lev,connectFree/lev,bsn069/luvit,bsn069/luvit,sousoux/luvit,rjeli/luvit,kaustavha/luvit,zhaozg/luvit,AndrewTsao/luvit,sousoux/luvit,rjeli/luvit,kaustavha/luvit,sousoux/luvit,GabrielNicolasAvellaneda/luvit-upstream,kaustavha/luvit,boundary/luvit,DBarney/luvit