Removing SimpleMock test from pandas.util.testing
Removing SimpleMock test

- [x] closes #21475
- [ ] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

restarted the HTTP failure. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=h1) Report
> Merging [#21482](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/bf1c3dc253c08e70c543ae09c146b72544e85df5?src=pr&el=desc) will **increase** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/21482/graphs/tree.svg?token=eZ4WkYLtcO&src=pr&height=150&width=650)](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #21482      +/-   ##
==========================================
+ Coverage   91.89%   91.92%   +0.02%     
==========================================
  Files         153      153              
  Lines       49604    49585      -19     
==========================================
- Hits        45584    45581       -3     
+ Misses       4020     4004      -16
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.32% <ø> (+0.02%)` | :arrow_up: |
| #single | `41.89% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/21482/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `85.96% <ø> (+1.35%)` | :arrow_up: |
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/21482/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.62% <0%> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=footer). Last update [bf1c3dc...edb4959](https://codecov.io/gh/pandas-dev/pandas/pull/21482?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @TomAugspurger any suggestions on how this could pass travis?
 > pandas/util/testing.py:2265:1: E302 expected 2 blank lines, found 1

lint issue lgtm. ping on green. @jreback . build and tests passed.
 thanks @uds5501 