Added a check for USE_SETCAP env variable and then SET USE_SETCAP

This is the same format as the use normal sudo. I don't know why the
default option of USE_SETCAP should have been ON but it didn't seem
to work.

I re ran catkin_make several times and had no issues. After exporting
USE_NORMAL_SUDO=1 and USE_SETCAP=true in the .bashrc .