provisioners/chef: Install in one command

plugins/provisioners/chef/cap/redhat/chef_install.rb

@@ -6,21 +6,17 @@ module VagrantPlugins
       module Redhat
         module ChefInstall
           def self.chef_install(machine, project, version, channel, options = {})
-            if dnf?(machine)
-              machine.communicate.sudo("dnf install -y -q curl")
+            machine.communicate.sudo <<-EOH.gsub(/^ {14}/, '')
+              if command -v dnf; then
+                dnf -y install curl
               else
-              machine.communicate.sudo("yum install -y -q curl")
-            end
+                yum -y install curl
+              fi
+            EOH
 
             command = Omnibus.sh_command(project, version, channel, options)
             machine.communicate.sudo(command)
           end
-
-          protected
-
-          def self.dnf?(machine)
-            machine.communicate.test("/usr/bin/which -s dnf")
-          end
         end
       end
     end