Raise typha max connections to 300 (#5527)

Raises limit from 100 to 300 because the default is far too low
and the pod can handle 300 with the given resources.

Change-Id: Ib1eec10da3d09d198933fcfe87291587e58d7cdb

roles/network_plugin/calico/templates/calico-typha.yml.j2

@@ -82,6 +82,8 @@ spec:
             value: "kubernetes"
           - name: TYPHA_HEALTHENABLED
             value: "true"
+          - name: TYPHA_MAXCONNECTIONSLOWERLIMIT
+            value: "{{ typha_max_connections_lower_limit }}"
 {% if typha_secure %}
           - name: TYPHA_CAFILE
             value: /etc/ca/ca.crt