fix -c argument handling

commit 829dd918 added parsing of a -c argument to both the common options
handling and to lxc-start. It is not a common option, and should have only
been added to lxc-start. Because the common code is processing it, no other
command can use -c. Remove -c from being processed by the common code.
Tested that -c still works with lxc-start.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
allow lxc-info to get running container configuration

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>