Fix retrieve_cpu_sets() output parsing (#1274)

Due to a greedy `*` atom in the regex, this
only gets the last **single** digit of the
available cpusets, so `15` becomes `5`. This
breaks validation of any jails' configured
cpuset property that might be greater than
the last output digit. Changing to a non-greedy
`*?` causes the regex to match all of the
final digits.

iocage_lib/ioc_json.py

@@ -199,7 +199,7 @@ def retrieve_cpu_sets():
             pass
         else:
             result = re.findall(
-                r'.*mask:.*(\d+)$',
+                r'.*mask:.*?(\d+)$',
                 output.stdout.split('\n')[0]
             )
             if result: