Add CONFIG_IP_SET for CNI

[r2d4]

Calico and other CNI plugins need the ipset kernel syscall enabled with CONFIG_IP_SET

From some discussions on slack, it looks like calico needs ipset enabled on the VM

2017-01-06T23:29:12.412819915Z 2017-01-06 23:29:12,409 [ERROR][15636/7] calico.felix.ipsets 467: Failed to check if ipset exists
2017-01-06T23:29:12.412823678Z Traceback (most recent call last):
2017-01-06T23:29:12.412826318Z   File "site-packages/calico/felix/ipsets.py", line 461, in exists
2017-01-06T23:29:12.412839121Z   File "site-packages/calico/felix/futils.py", line 355, in check_call
2017-01-06T23:29:12.412841739Z FailedSystemCall: Failed system call (retcode : 1, args : ('ipset', 'list', 'felix-all-ipam-pools-tmp'))
2017-01-06T23:29:12.412885664Z   stdout  : 
2017-01-06T23:29:12.412889933Z   stderr  : ipset v6.29: Kernel error received: Invalid argument
2017-01-06T23:29:12.412892454Z 
2017-01-06T23:29:12.412894776Z   input  : None

I've uploaded a new ISO at https://storage.googleapis.com/minikube/iso/minikube-v1.0.2.iso

[r2d4]

Should fix #973

[codecov-io]

Current coverage is 34.81% (diff: 100%)

Merging #972 into master will not change coverage

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