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/cert-manager/cert-manager/app/helmrelease.yaml.j2

@@ -21,7 +21,9 @@ spec:
     remediation:
       retries: 3
   values:
-    installCRDs: true
+    crds:
+      enabled: true
+      keep: true
     dns01RecursiveNameservers: https://1.1.1.1:443/dns-query,https://1.0.0.1:443/dns-query
     dns01RecursiveNameserversOnly: true
     prometheus: