Description of Issue/Question

The following error message is spamming my master log

[salt.loader                                                ][CRITICAL][80377] Failed to load grains defined in grain file disks.disks in function <function disks at 0x80cff9140>, error:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/salt/loader.py", line 724, in grains
    ret = fun()
  File "/usr/local/lib/python2.7/site-packages/salt/grains/disks.py", line 31, in disks
    return _freebsd_geom()
  File "/usr/local/lib/python2.7/site-packages/salt/grains/disks.py", line 107, in _freebsd_geom
    parse_geom_attribs(device)
  File "/usr/local/lib/python2.7/site-packages/salt/grains/disks.py", line 94, in parse_geom_attribs
    search.group(1))
  File "/usr/local/lib/python2.7/site-packages/salt/grains/disks.py", line 69, in _datavalue
    return int(data)
ValueError: invalid literal for int() with base 10: 'unknown'

Setup

happens existing and/or on fresh master without SLS files

Steps to Reproduce Issue

run salt-master on FreeBSD

Versions Report

salt --versions-report
Salt Version:
Salt: 2016.3.0

Dependency Versions:
cffi: Not Installed
cherrypy: Not Installed
dateutil: 2.5.0
gitdb: Not Installed
gitpython: Not Installed
ioflo: Not Installed
Jinja2: 2.8
libgit2: Not Installed
libnacl: Not Installed
M2Crypto: Not Installed
Mako: Not Installed
msgpack-pure: Not Installed
msgpack-python: 0.4.7
mysql-python: Not Installed
pycparser: Not Installed
pycrypto: 2.6.1
pygit2: Not Installed
Python: 2.7.11 (default, May 9 2016, 20:02:36)
python-gnupg: Not Installed
PyYAML: 3.11
PyZMQ: 15.2.0
RAET: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 4.3
ZMQ: 4.1.4

System Versions:
dist:
machine: amd64
release: 10.3-RELEASE-p3
system: FreeBSD
version: Not Installed