Automatic merge from submit-queue
azure: support nics with multiple ipconfigs
**What this PR does / why we need it**:
When I initially wrote the cloudprovider, the ipconfig primary field either wasn't present or wasn't populated. Now it is and we have someone trying to use kubelet on a node with a nic with multiple ipconfigs and they ran into this.
**Which issue this PR fixes**: n/a no issue filed.
**Special notes for your reviewer**:
**Release note**:
```release-note
azure: support multiple ipconfigs on a NIC
```
If we can get this backported to 1.4.x, that would be great.
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