Add get_dmi_facts in setup for FreeBSD systems using dmidecode

library/system/setup

@@ -943,6 +943,7 @@ class FreeBSDHardware(Hardware):
     def populate(self):
         self.get_cpu_facts()
         self.get_memory_facts()
+        self.get_dmi_facts()
         self.get_device_facts()
         self.get_mount_facts()
         return self.facts
@@ -1012,6 +1013,41 @@ class FreeBSDHardware(Hardware):
                 if s:
                     self.facts['devices'][d.group(1)].append(s.group(1))
 
+    def get_dmi_facts(self):
+        ''' learn dmi facts from system
+
+        Use dmidecode executable if available'''
+
+        # Fall back to using dmidecode, if available
+        dmi_bin = module.get_bin_path('dmidecode')
+        DMI_DICT = {
+                'bios_date': 'bios-release-date',
+                'bios_version': 'bios-version',
+                'form_factor': 'chassis-type',
+                'product_name': 'system-product-name',
+                'product_serial': 'system-serial-number',
+                'product_uuid': 'system-uuid',
+                'product_version': 'system-version',
+                'system_vendor': 'system-manufacturer'
+                }
+        for (k, v) in DMI_DICT.items():
+            if dmi_bin is not None:
+                (rc, out, err) = module.run_command('%s -s %s' % (dmi_bin, v))
+                if rc == 0:
+                    # Strip out commented lines (specific dmidecode output)
+                    thisvalue = ''.join([ line for line in out.split('\n') if not line.startswith('#') ])
+                    try:
+                        json.dumps(thisvalue)
+                    except UnicodeDecodeError:
+                        thisvalue = "NA"
+
+                    self.facts[k] = thisvalue
+                else:
+                    self.facts[k] = 'NA'
+            else:
+                self.facts[k] = 'NA'
+
+
 class NetBSDHardware(Hardware):
     """
     NetBSD-specific subclass of Hardware.  Defines memory and CPU facts: