add f5 as supported LB (#2733)

* add f5 as supported LB

* update doc for supported LB provider

Author: archerwu9425

docs/openstack-cloud-controller-manager/using-openstack-cloud-controller-manager.md

@@ -211,7 +211,7 @@ Although the openstack-cloud-controller-manager was initially implemented with N
   If `lb-provider` is set to "ovn" the value must be set to `SOURCE_IP_PORT`.
 
 * `lb-provider`
-  Optional. Used to specify the provider of the load balancer, e.g. "amphora" (default), "octavia" (deprecated alias for "amphora"), or "ovn". Only the "amphora", "octavia", and "ovn" providers are officially tested, other providers will cause a warning log.
+  Optional. Used to specify the provider of the load balancer, e.g. "amphora" (default), "octavia" (deprecated alias for "amphora"), "ovn" or "f5". Only the "amphora", "octavia", "ovn" and "f5" providers are officially tested, other providers will cause a warning log.
 
 * `lb-version`
   Optional. If specified, only "v2" is supported.

pkg/openstack/openstack.go

@@ -63,7 +63,7 @@ const (
 var userAgentData []string
 
 // supportedLBProvider map is used to define LoadBalancer providers that we support
-var supportedLBProvider = []string{"amphora", "octavia", "ovn"}
+var supportedLBProvider = []string{"amphora", "octavia", "ovn", "f5"}
 
 // supportedContainerStore map is used to define supported tls-container-ref store
 var supportedContainerStore = []string{"barbican", "external"}