Automatic merge from submit-queue

Improve the multiarch situation; armel => armhf; reenable pcc64le; remove the patched golang

**What this PR does / why we need it**: 
 - Improves the multiarch situation as described in #38067 
 - Tries to bump to go1.8 for arm (and later enable ppc64le)
 - GOARM 6 => GOARM 7
 - Remove the golang 1.7 patch
 - armel => armhf
 - Bump QEMU version to v2.7.0

**Release note**:

```release-note
Improve the ARM builds and make hyperkube on ARM working again by upgrading the Go version for ARM to go1.8beta2
```

@kubernetes/sig-testing-misc @jessfraz @ixdy @jbeda @david-mcmahon @pwittrock