Add optional arguments for external cloud controller manager DaemonSet

[JorenZ]

What would you like to be added:
The option to add arguments to the external cloud controller manager DaemonSet.

Why is this needed:
In our case, we wanted to harden our TLS setup so we wanted to add --tls-min-version=VersionTLS13.

At any rate, the cloud controller manager has many more command line options than are currently hardcoded in the DaemonSet templates in kubespray/roles/kubernetes-apps/external_cloud_controller/openstack/ and kubespray/roles/kubernetes-apps/external_cloud_controller/vsphere.

The current arguments are

            - --v=1
            - --cloud-config=$(CLOUD_CONFIG)
            - --cloud-provider=openstack
            - --use-service-account-credentials=true
            - --address=127.0.0.1

(openstack) and

            - --v=2
            - --cloud-provider=vsphere
            - --cloud-config=/etc/cloud/vsphere.conf

(vsphere), respectively.