extend api/disk regex to include additional chars rockstor#1320

As /dev/disk/by-id names contain colons, underscores and
dashes we need to include these in our extended disk_regex
to accommodate the move to by-id names in the Disk.name
db field.

src/rockstor/storageadmin/urls/disks.py

@@ -19,7 +19,7 @@
 from django.conf.urls import patterns, url
 from storageadmin.views import (DiskListView, DiskDetailView, DiskSMARTDetailView)
 
-disk_regex = '[A-Za-z0-9]+[A-Za-z0-9]*'
+disk_regex = '[A-Za-z0-9]+[A-Za-z0-9:_-]*'
 
 urlpatterns = patterns(
     '',