External datastore support (#879)

* Adding new k3s function to get the config
* Adding a new way to get the bootstrap data directly from the server Pod
* Gate the bootstrap fetch if external datastore is in use
---------

Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

pkg/controller/cluster/agent/agent.go

@@ -29,11 +29,11 @@ type Config struct {
 	scheme  *runtime.Scheme
 }
 
-func NewConfig(cluster *v1beta1.Cluster, client ctrlruntimeclient.Client, scheme *runtime.Scheme) *Config {
+func NewConfig(cluster *v1beta1.Cluster, client ctrlruntimeclient.Client) *Config {
 	return &Config{
 		cluster: cluster,
 		client:  client,
-		scheme:  scheme,
+		scheme:  client.Scheme(),
 	}
 }