automation should use apt-get instead of apt
automation should use apt-get instead of apt

Summary:
Automation should use `apt-get` instead of `apt`, as `apt` does not
have a stable interface.

This fixes a warning when running getdeps.py on recent Ubuntu:

```
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
```

Reviewed By: fanzeyi

Differential Revision: D39031719

fbshipit-source-id: 54a0fe51ce159174b089fc446e99a4ab5d69d626

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift