ARROW-1056: [Python] Ignore pandas index in parquet+hdfs test
ARROW-1056: [Python] Ignore pandas index in parquet+hdfs test

I have all the tests passing again:

```shell
$ py.test pyarrow --hdfs
===================================== test session starts =====================================
platform linux -- Python 3.5.1, pytest-3.0.6, py-1.4.31, pluggy-0.4.0
rootdir: /home/wesm/code/arrow/python, inifile: setup.cfg
collected 227 items

pyarrow/tests/test_array.py ...........
pyarrow/tests/test_convert_builtin.py ......................
pyarrow/tests/test_convert_pandas.py ............................x....
pyarrow/tests/test_deprecations.py ..
pyarrow/tests/test_feather.py .......................x....
pyarrow/tests/test_hdfs.py ...............
pyarrow/tests/test_io.py ..................
pyarrow/tests/test_ipc.py .............x
pyarrow/tests/test_jemalloc.py ..
pyarrow/tests/test_parquet.py ...........................
pyarrow/tests/test_scalars.py ..........
pyarrow/tests/test_schema.py ..............
pyarrow/tests/test_table.py ...............
pyarrow/tests/test_tensor.py ................
```

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #728 from wesm/ARROW-1056 and squashes the following commits:

aa3d468 [Wes McKinney] Ignore pandas index in parquet+hdfs test

kou/arrow,itaiin/arrow,dremio/arrow,wesm/arrow,laurentgo/arrow,wesm/arrow,siddharthteotia/arrow,majetideepak/arrow,laurentgo/arrow,siddharthteotia/arrow,wesm/arrow,siddharthteotia/arrow,laurentgo/arrow,xhochy/arrow,pcmoritz/arrow,majetideepak/arrow,kou/arrow,jeffknupp/arrow,laurentgo/arrow,tebeka/arrow,renesugar/arrow,majetideepak/arrow,cpcloud/arrow,kou/arrow,apache/arrow,majetideepak/arrow,kou/arrow,tebeka/arrow,dremio/arrow,apache/arrow,NonVolatileComputing/arrow,majetideepak/arrow,icexelloss/arrow,kou/arrow,itaiin/arrow,icexelloss/arrow,yufeldman/arrow,laurentgo/arrow,jeffknupp/arrow,kou/arrow,xhochy/arrow,apache/arrow,apache/arrow,xhochy/arrow,laurentgo/arrow,pcmoritz/arrow,wagavulin/arrow,kou/arrow,laurentgo/arrow,cpcloud/arrow,tebeka/arrow,icexelloss/arrow,pcmoritz/arrow,cpcloud/arrow,laurentgo/arrow,pcmoritz/arrow,yufeldman/arrow,kou/arrow,xhochy/arrow,majetideepak/arrow,tebeka/arrow,NonVolatileComputing/arrow,laurentgo/arrow,apache/arrow,kou/arrow,wesm/arrow,pcmoritz/arrow,itaiin/arrow,wagavulin/arrow,apache/arrow,dremio/arrow,cpcloud/arrow,majetideepak/arrow,majetideepak/arrow,yufeldman/arrow,jeffknupp/arrow,renesugar/arrow,wesm/arrow,renesugar/arrow,laurentgo/arrow,cpcloud/arrow,xhochy/arrow,kou/arrow,cpcloud/arrow,laurentgo/arrow,wagavulin/arrow,icexelloss/arrow,renesugar/arrow,laurentgo/arrow,itaiin/arrow,siddharthteotia/arrow,icexelloss/arrow,majetideepak/arrow,apache/arrow,xhochy/arrow,pcmoritz/arrow,yufeldman/arrow,itaiin/arrow,NonVolatileComputing/arrow,NonVolatileComputing/arrow,xhochy/arrow,tebeka/arrow,renesugar/arrow,renesugar/arrow,jeffknupp/arrow,xhochy/arrow,majetideepak/arrow,tebeka/arrow,tebeka/arrow,tebeka/arrow,wesm/arrow,apache/arrow,itaiin/arrow,majetideepak/arrow,jeffknupp/arrow,wagavulin/arrow,jeffknupp/arrow,itaiin/arrow,majetideepak/arrow,pcmoritz/arrow,dremio/arrow,pcmoritz/arrow,itaiin/arrow,majetideepak/arrow,itaiin/arrow,apache/arrow,kou/arrow,cpcloud/arrow,xhochy/arrow,renesugar/arrow,wagavulin/arrow,icexelloss/arrow,icexelloss/arrow,siddharthteotia/arrow,yufeldman/arrow,dremio/arrow,wesm/arrow,NonVolatileComputing/arrow,xhochy/arrow,siddharthteotia/arrow,apache/arrow,pcmoritz/arrow,siddharthteotia/arrow,pcmoritz/arrow,wesm/arrow,icexelloss/arrow,yufeldman/arrow,icexelloss/arrow,siddharthteotia/arrow,cpcloud/arrow,NonVolatileComputing/arrow,jeffknupp/arrow,renesugar/arrow,wesm/arrow,kou/arrow,NonVolatileComputing/arrow,wagavulin/arrow,siddharthteotia/arrow,icexelloss/arrow,dremio/arrow,renesugar/arrow,jeffknupp/arrow,renesugar/arrow,wagavulin/arrow,itaiin/arrow,pcmoritz/arrow,wagavulin/arrow,yufeldman/arrow,siddharthteotia/arrow,renesugar/arrow,wagavulin/arrow,yufeldman/arrow,NonVolatileComputing/arrow,icexelloss/arrow,itaiin/arrow,cpcloud/arrow,kou/arrow,dremio/arrow,itaiin/arrow,dremio/arrow,cpcloud/arrow,yufeldman/arrow,apache/arrow,tebeka/arrow,icexelloss/arrow,yufeldman/arrow,wesm/arrow,xhochy/arrow,renesugar/arrow,icexelloss/arrow,pcmoritz/arrow,dremio/arrow,pcmoritz/arrow,icexelloss/arrow,laurentgo/arrow,renesugar/arrow,tebeka/arrow,wesm/arrow,renesugar/arrow,NonVolatileComputing/arrow,renesugar/arrow,xhochy/arrow,kou/arrow,dremio/arrow,xhochy/arrow,xhochy/arrow,itaiin/arrow,itaiin/arrow,majetideepak/arrow,apache/arrow,apache/arrow,NonVolatileComputing/arrow,jeffknupp/arrow,siddharthteotia/arrow,cpcloud/arrow,cpcloud/arrow,wagavulin/arrow,majetideepak/arrow,xhochy/arrow,NonVolatileComputing/arrow,wesm/arrow,cpcloud/arrow,wesm/arrow,dremio/arrow,pcmoritz/arrow,cpcloud/arrow,yufeldman/arrow,apache/arrow,laurentgo/arrow,laurentgo/arrow,jeffknupp/arrow,wesm/arrow,wagavulin/arrow,pcmoritz/arrow,itaiin/arrow,wagavulin/arrow,jeffknupp/arrow