Fix _find_all_fs() so it finds all the filesystems

Modified _match_mdtstat() and _match_oststat() to compare 
both the filesystem and the numeric portion of the target name.
The prior code compared only the numeric portion.  If the cerebro
polling data included >1 mdt with the same number but different
filesystem names, _update_mdt() would create an mdt_data
record for the first mdt encountered in the poll results, and then
modify it for each subsequent mdt found with that number.  This
then meant that those mdt's did not appear in the list built by_find_all_fs().
This change results in each mdt having a record in mdt_data.
The same logic applies to the _match_oststat() and _update_ost,
except that the impact of the bug was inaccurate OST counts for each 
filesystem.