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common.sh fix to detect ip instead of ifconfig

**What this PR does / why we need it**: The IP address detection recently [added](https://github.com/kubernetes/kubernetes/commit/ca76002) to build/common.sh to whitelist the host IP will error if ifconfig is not installed. This patch detects if `ip` is installed and then uses `ip` instead of `ifconfig`.

**Which issue this PR fixes**

**Special notes for your reviewer**:

**Release note**:

/cc @zhouhaibing089