Use python, not groups to grab a user group in t/test-meta.sh.
Use python, not groups to grab a user group in t/test-meta.sh.

Group names may actually contain spaces, and since the groups commmand
only reports a space-delimited list of groups on stdout, we had
a problem.

Thanks to "Oei, Yung-Chin" <yungchin@yungchin.nl> and Gabriel Filion
<lelutin@gmail.com> for tracking this down.

Signed-off-by: Rob Browning <1dc5917c2adeeba13d1ef33dbb40691a1b67cc65@defaultvalue.org>
Reviewed-by: Zoran Zaric <d7dacae2c968388960bf8970080a980ed5c5dcb7@zoranzaric.de>

mhoeher/bup,ToxicFrog/bup,tjanez/bup,jbaber/bup,jbaber/bup,tjanez/bup,gevaerts/bup,pombredanne/bup,mhoeher/bup,apenwarr/bup,ToxicFrog/bup,jbaber/bup,jbaber/bup,gevaerts/bup,mhoeher/bup,gevaerts/bup,ToxicFrog/bup,apenwarr/bup,mhoeher/bup,pombredanne/bup,mhoeher/bup,gevaerts/bup,pombredanne/bup,jbaber/bup,apenwarr/bup,pombredanne/bup,tjanez/bup,gevaerts/bup,pombredanne/bup,tjanez/bup,apenwarr/bup,ToxicFrog/bup,pombredanne/bup,mhoeher/bup,tjanez/bup,tjanez/bup,jbaber/bup,ToxicFrog/bup