improved storageID lookup
improved storageID lookup

The patch should fix a problem which was caused by multiple matches for the `storageID' parameter
due to a too generous grep statement. With the modification it is more likely that only one match is
returned. Additionally it should solve the problem that grep for "volume1" also matches "volume10".

.1.3.6.1.2.1.25.2.3.1.3.38 = /volume1
.1.3.6.1.2.1.25.2.3.1.3.50 = /tmp/timebkp_23967/volume1
exensio/synology-nagios-plugin