Mitigate CI flakiness (#70)

* Increase SSH connection timeouts and retries

* Make MetalLB timeouts configurable

* Retry applying MetalLB CRs

* Fix location of MetalLB CRs template

* Make MetalLB wait logic more compact

* Fix typo

* retrigger 1

* retrigger 2

* retrigger 3

* retrigger 4

* retrigger 5

roles/k3s/post/templates/metallb.crs.j2

@@ -0,0 +1,14 @@
+apiVersion: metallb.io/v1beta1
+kind: IPAddressPool
+metadata:
+  name: first-pool
+  namespace: metallb-system
+spec:
+  addresses:
+  - {{ metal_lb_ip_range }}
+---
+apiVersion: metallb.io/v1beta1
+kind: L2Advertisement
+metadata:
+  name: default
+  namespace: metallb-system