libcgroup: Make cgconfigparser more verbose

libcgroup: Make cgconfigparser more verbose

As per http://sourceforge.net/tracker/?func=detail&atid=1043649&aid=2128139&group_id=218421
cgconfigparser was not exiting silently for wrong usage.  Let's
let the user know they are using wrong syntax.

Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Tested-by: Sudhir Kumar <sudhir@linux.vnet.ibm.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
git-svn-id: https://libcg.svn.sourceforge.net/svnroot/libcg/trunk@221 4f4bb910-9a46-0410-90c8-c897d4f1cd53