Merge pull request #54176 from gonzolino/os-lbaas-provider

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Make OpenStack LBaaS v2 Provider configurable

Add option 'lb-provider' to the Loadbalancer section of the OpenStack
cloudprovider configuration to allow using a different LBaaS v2
provider than the default.



**What this PR does / why we need it**:
This PR allows to use a different OpenStack LBaaS v2 provider than the default of the OpenStack cloud.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
Added option lb-provider to OpenStack cloud provider config
```

pkg/cloudprovider/providers/openstack/openstack_test.go

@@ -169,6 +169,7 @@ func TestCheckOpenStackOpts(t *testing.T) {
 					SubnetId:             "6261548e-ffde-4bc7-bd22-59c83578c5ef",
 					FloatingNetworkId:    "38b8b5f9-64dc-4424-bf86-679595714786",
 					LBMethod:             "ROUND_ROBIN",
+					LBProvider:           "haproxy",
 					CreateMonitor:        true,
 					MonitorDelay:         delay,
 					MonitorTimeout:       timeout,