tools/cgsnapshot: limit the controller to search to user lists

tools/cgsnapshot: limit the controller to search to user lists

is_ctlr_on_list(), returns on the first match of the list of controllers
the user has passed on the command line, this might serve as an
optimization but as a side effect we search through the whole list of
controllers, those the user has not asked for. Let's reset the list of
controllers to controllers available on wanted_consts array (list of
controllers required by the user) and controllers array (list of
available controllers).

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>