Rename GHTorrent configuration environment variables
Rename GHTorrent configuration environment variables

The ghtorrent and augur_db plugins were both trying to
use the same set of the environment variables to connect
to their respective databases. Since the data for these two
plugins lives in two different databases, the GHTorrent ones
have been renamed to prevent this conflict.

Signed-off-by: Carter Landis <ffc486ac0b21a34cfd7d1170183ed86b0f1b04a2@gmail.com>

OSSHealth/ghdata,OSSHealth/ghdata,OSSHealth/ghdata