now won't throw exception if we don't have permission to stat a mtab

entry on linux (weird chromebook issue)
Signed-off-by: Brian Coca <briancoca+dev@gmail.com>

system/setup

@@ -626,6 +626,7 @@ class LinuxHardware(Hardware):
             if line.startswith('/'):
                 fields = line.rstrip('\n').split()
                 if(fields[2] != 'none'):
+                    try:
                         statvfs_result = os.statvfs(fields[1])
                         self.facts['mounts'].append(
                             {'mount': fields[1],
@@ -636,6 +637,17 @@ class LinuxHardware(Hardware):
                              'size_total': statvfs_result.f_bsize * statvfs_result.f_blocks,
                              'size_available': statvfs_result.f_bsize * (statvfs_result.f_bavail),
                              })
+                    except OSError, e:
+                        # don't have access to stat so we'll set to None
+                        self.facts['mounts'].append(
+                            {'mount': fields[1],
+                             'device':fields[0],
+                             'fstype': fields[2],
+                             'options': fields[3],
+                             # statvfs data
+                             'size_total': None,
+                             'size_available': None,
+                             })
 
     def get_device_facts(self):
         self.facts['devices'] = {}