Misleading error for pd.read_msgpack
#### Code Sample, a copy-pastable example if possible

```python
import pandas as pd
pd.read_msgpack('this/path/does/not/exist')

```
#### Problem description

Such an error is misleading because it suggests that there is a problem with the datatype being passed, not that the path does not exist. The error raised is:

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File ".local/anaconda3/lib/python3.7/site-packages/pandas/io/packers.py", line 226, in read_msgpack
    raise ValueError('path_or_buf needs to be a string file path or file-like')
ValueError: path_or_buf needs to be a string file path or file-like
```

#### Expected Output

Raise an error indicating that the path was not found.

#### Output of ``pd.show_versions()``

<details>
>>> pd.show_versions()

INSTALLED VERSIONS
------------------
commit: None
python: 3.7.3.final.0
python-bits: 64
OS: Linux
OS-release: 4.18.0-24-generic
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.24.2
pytest: 4.3.1
pip: 19.0.3
setuptools: 40.8.0
Cython: 0.29.6
numpy: 1.16.2
scipy: 1.2.1
pyarrow: None
xarray: None
IPython: 7.4.0
sphinx: 1.8.5
patsy: 0.5.1
dateutil: 2.8.0
pytz: 2018.9
blosc: None
bottleneck: 1.2.1
tables: 3.5.1
numexpr: 2.6.9
feather: None
matplotlib: 3.0.3
openpyxl: 2.6.1
xlrd: 1.2.0
xlwt: 1.3.0
xlsxwriter: 1.1.5
lxml.etree: 4.3.2
bs4: 4.7.1
html5lib: 1.0.1
sqlalchemy: 1.3.1
pymysql: None
psycopg2: None
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datarea

</details>
