Add "dataprovider" command to bin/ushahidi, refs T235

Summary: Also disables oauth commands, pending T305.

Test Plan:
Configure a data provider: https://wiki.ushahidi.com/display/WIKI/Configuring+data+sources+in+Ushahidi+V3

```
bin/ushahidi dataprovider
bin/ushahidi dataprovider incoming
bin/ushahidi dataprovider outgoing
bin/ushahidi dataprovider incoming -p email
bin/ushahidi dataprovider incoming -p email -l 1
bin/ushahidi dataprovider list -a
```

Reviewers: aMoniker, vladimir, eyedol, rjmackay

Reviewed By: eyedol

Subscribers: dkobia, rjmackay, srutto

Maniphest Tasks: T235

Differential Revision: https://phabricator.ushahidi.com/D489