cidr everywhere: check all middleware (#915)

* cidr everywhere: check all middleware

Add tests for cidr in only that middleware that already tests for this.
Check the other ones manually (and put reverse in the tests cases
anyway).

Make etcd setup_test run without +build etcd tag - it is not needed
for this test - move rest of the code to lookup_test.go.

Cleanup proxy test a bit and remove TempDir as there is test.TempFile
that does the same thing.

Fixes #909

* coredns package

* Fix test compile

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