niacctbase: add lvuser to group "plugdev"
niacctbase: add lvuser to group "plugdev"

This grants direct access to USB devices for LabVIEW RT apps.

Natinst-Rally-ID: TA47739
Natinst-CAR-ID: 442037
Natinst-ReviewBoard-ID: 58630
Signed-off-by: Richard Tollerton <67c688e7f7482ba5c4ebe3d70bc77594748182a6@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt