Various Improvements (#1586)

* Cert-Manager: Replace depricated "installCRDs"

* Cilium: Replace deprecated "io.cilium/lb-ipam-ips" annotation

* Sysctls: Up `net.core.rmem_max` and `net.core.wmem_max` for Cloudflared

bootstrap/templates/kubernetes/apps/network/k8s-gateway/app/helmrelease.yaml.j2

@@ -28,6 +28,6 @@ spec:
       type: LoadBalancer
       port: 53
       annotations:
-        io.cilium/lb-ipam-ips: "#{ bootstrap_cloudflare.gateway_vip }#"
+        lbipam.cilium.io/ips: "#{ bootstrap_cloudflare.gateway_vip }#"
       externalTrafficPolicy: Cluster
     watchedResources: ["Ingress", "Service"]