workshop: Increase RAM for VMs to Avoid OOM

- Update all VMs to have 2GB of RAM

Fixes: https://pagure.io/freeipa/issue/9720
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

doc/workshop/Vagrantfile

@@ -13,24 +13,17 @@ Vagrant.configure(2) do |config|
 
   config.vm.provider :libvirt do |libvirt|
     libvirt.qemu_use_session = false
-    libvirt.memory = 1024
+    libvirt.memory = 2048
   end
 
   config.vm.provider :virtualbox do |virtualbox|
-    virtualbox.memory = 1536
+    virtualbox.memory = 2048
   end
 
   config.vm.define "server" do |server|
     server.vm.network "private_network", ip: "192.168.33.10"
     server.vm.hostname = "server.ipademo.local"
 
-    config.vm.provider "virtualbox" do |v|
-      v.memory = 1536
-    end
-    config.vm.provider "libvirt" do |v|
-      v.memory = 1536
-    end
-
   end
 
   config.vm.define "replica" do |replica|
@@ -45,14 +38,6 @@ Vagrant.configure(2) do |config|
       inline: 'printf "DNS=192.168.33.10\nDomains=~." >> /etc/systemd/resolved.conf'
     replica.vm.provision "shell",
       inline: 'systemctl restart systemd-resolved'
-
-    config.vm.provider "virtualbox" do |v|
-      v.memory = 1536
-    end
-    config.vm.provider "libvirt" do |v|
-      v.memory = 1536
-    end
-
   end
 
   config.vm.define "client" do |client|