Vagrantfile: Fix incorrect references to 'rhel' variable as 'redhat' (#6967)

Vagrantfile

@@ -179,7 +179,7 @@ Vagrant.configure("2") do |config|
         node.vm.network "forwarded_port", guest: guest, host: host, auto_correct: true
       end
 
-      if ["redhat7","redhat8"].include? $os
+      if ["rhel7","rhel8"].include? $os
         # Vagrant synced_folder rsync options cannot be used for RHEL boxes as Rsync package cannot
         # be installed until the host is registered with a valid Red Hat support subscription
         node.vm.synced_folder ".", "/vagrant", disabled: false
@@ -200,7 +200,7 @@ Vagrant.configure("2") do |config|
       node.vm.provision "shell", inline: "swapoff -a"
 
       # Disable firewalld on oraclelinux/redhat vms
-      if ["oraclelinux","oraclelinux8","redhat7","redhat8"].include? $os
+      if ["oraclelinux","oraclelinux8","rhel7","rhel8"].include? $os
         node.vm.provision "shell", inline: "systemctl stop firewalld; systemctl disable firewalld"
       end