Merge pull request #51588 from karataliu/accm

Automatic merge from submit-queue

Fix splitProviderID for Azure

**What this PR does / why we need it**:
#46940 add 'splitProviderID' for Azure to get node name from provider, but it captures the resource id instead of node name.

Functions such as NodeAddresses are accepting node names:
84d9778f22/pkg/cloudprovider/providers/azure/azure_instances.go (L32)

With current implementation, it takes in a resource ID, and will result in following error
```
E0830 04:15:09.877143   10427 azure_instances.go:63] error: az.NodeAddresses, az.getIPForMachine(/subscriptions/{id}/resourceGroups/{id}/providers/Microsoft.Compute/virtualMachines/k8s-master-0), err=instance not found
```

This fix makes is return node names instead.


**Which issue this PR fixes**

**Special notes for your reviewer**:

**Release note**:
`NONE`


@brendandburns  @realfake @wlan0

pkg/cloudprovider/providers/azure/azure_test.go

@@ -779,7 +779,7 @@ func TestSplitProviderID(t *testing.T) {
 	}{
 		{
 			providerID: CloudProviderName + ":///subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroupName/providers/Microsoft.Compute/virtualMachines/k8s-agent-AAAAAAAA-0",
-			name:       "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/myResourceGroupName/providers/Microsoft.Compute/virtualMachines/k8s-agent-AAAAAAAA-0",
+			name:       "k8s-agent-AAAAAAAA-0",
 			fail:       false,
 		},
 		{

pkg/cloudprovider/providers/azure/azure_util.go

@@ -46,7 +46,7 @@ const (
 	securityRuleIDTemplate      = "/subscriptions/%s/resourceGroups/%s/providers/Microsoft.Network/networkSecurityGroups/%s/securityRules/%s"
 )
 
-var providerIDRE = regexp.MustCompile(`^` + CloudProviderName + `://(.+)$`)
+var providerIDRE = regexp.MustCompile(`^` + CloudProviderName + `://(?:.*)/Microsoft.Compute/virtualMachines/(.+)$`)
 
 // returns the full identifier of a machine
 func (az *Cloud) getMachineID(machineName string) string {