Add option to disable MetalLB, for use w/ ext LBs (#383)

* Add option to disable MetalLB, for use w/ ext LBs

* Add option to disable MetalLB, for use w/ ext LBs - add defaults

* Skip MetalLB with tags instead of flag

roles/k3s_server/tasks/main.yml

@@ -17,6 +17,7 @@
 
 - name: Deploy metallb manifest
   include_tasks: metallb.yml
+  tags: metallb
 
 - name: Init cluster inside the transient k3s-init service
   command: