stub out the `which` command for ChefSpec
stub out the `which` command for ChefSpec

Sauraus/chef_nginx,8la/nginx,kri5/nginx,ttab/nginx,8la/nginx,myplaceonline/nginx,ffuenf/nginx,luishdez/nginx-cookbook,fsultan/nginx,evertrue/nginx-cookbook,ffuenf/nginx,miketheman/nginx,periscopedevelopment/nginx,luishdez/nginx-cookbook,newlywish/nginx,AudaxHealthInc/nginx,AudaxHealthInc/nginx,Roblox/chef_nginx,newlywish/nginx,Roblox/chef_nginx,chef-cookbooks/chef_nginx,Altiscale/nginx,myplaceonline/nginx,kri5/nginx,auth0/chef-nginx,8la/nginx,blmlove409/nginx_cookbook,cokeboL/nginx,miketheman/nginx,cokeboL/nginx,luishdez/nginx-cookbook,auth0/chef-nginx,miketheman/nginx,fsultan/nginx,cokeboL/nginx,ttab/nginx,axos88/chef_nginx,cpbtechnology/nginx,7bfa689ac3c4be50f8ba6c1ea8c5f316/nginx,chef-cookbooks/chef_nginx,Sauraus/chef_nginx,periscopedevelopment/nginx,blmlove409/nginx_cookbook,evertrue/nginx-cookbook,7bfa689ac3c4be50f8ba6c1ea8c5f316/nginx,axos88/chef_nginx,7bfa689ac3c4be50f8ba6c1ea8c5f316/nginx,Sauraus/chef_nginx,newlywish/nginx,blmlove409/nginx_cookbook,ttab/nginx,fsultan/nginx,cpbtechnology/nginx,periscopedevelopment/nginx,ffuenf/nginx,axos88/chef_nginx,Altiscale/nginx,kri5/nginx,Roblox/chef_nginx,evertrue/nginx-cookbook,Altiscale/nginx,AudaxHealthInc/nginx,chef-cookbooks/chef_nginx,cpbtechnology/nginx