Vendor gotestyourself

and remove testify and spew

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

vendor/github.com/google/go-cmp/README.md

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+# Package for equality of Go values
+
+[![GoDoc](https://godoc.org/github.com/google/go-cmp/cmp?status.svg)][godoc]
+[![Build Status](https://travis-ci.org/google/go-cmp.svg?branch=master)][travis]
+
+This package is intended to be a more powerful and safer alternative to
+`reflect.DeepEqual` for comparing whether two values are semantically equal.
+
+The primary features of `cmp` are:
+
+* When the default behavior of equality does not suit the needs of the test,
+  custom equality functions can override the equality operation.
+  For example, an equality function may report floats as equal so long as they
+  are within some tolerance of each other.
+
+* Types that have an `Equal` method may use that method to determine equality.
+  This allows package authors to determine the equality operation for the types
+  that they define.
+
+* If no custom equality functions are used and no `Equal` method is defined,
+  equality is determined by recursively comparing the primitive kinds on both
+  values, much like `reflect.DeepEqual`. Unlike `reflect.DeepEqual`, unexported
+  fields are not compared by default; they result in panics unless suppressed
+  by using an `Ignore` option (see `cmpopts.IgnoreUnexported`) or explictly
+  compared using the `AllowUnexported` option.
+
+See the [GoDoc documentation][godoc] for more information.
+
+This is not an official Google product.
+
+[godoc]: https://godoc.org/github.com/google/go-cmp/cmp
+[travis]: https://travis-ci.org/google/go-cmp
+
+## Install
+
+```
+go get -u github.com/google/go-cmp/cmp
+```
+
+## License
+
+BSD - See [LICENSE][license] file
+
+[license]: https://github.com/google/go-cmp/blob/master/LICENSE