Support for Pyodbc

[chriddyp]

This branch demonstrates how to install pyodbc on Plotly On-Premise. See Files Changed to see the differences between this configuration and the basic configuration.

Notes:

• System-level packages are installed through apt-get and are specified in the apt-packages file
• Empty odbc.ini and odbcinist.ini files are included in the repository and are copied into the appropriate directory with standard app.json file. app.json calls setup_odbc via the predeploy key. Fill out odbc.ini and odbcinst.ini files out with your own odbc settings.

To run these files on your own machine, you can pull this branch and merge it into your master branch with:

git clone https://github.com/plotly/dash-on-premise-sample-app my-app
cd my-app
git merge pyodbc  # merges pyodbc into master

and then you can follow the rest of the instructions in https://plot.ly/dash/deployment/on-premise