Add some more OpenBSD facts

added:
 * ansible_distribution
 * ansible_distribution_release
 * ansible_distribution_version

library/system/setup

@@ -268,6 +268,15 @@ class Facts(object):
             self.facts['distribution'] = 'FreeBSD'
             self.facts['distribution_release'] = platform.release()
             self.facts['distribution_version'] = platform.version()
+        elif self.facts['system'] == 'OpenBSD':
+            self.facts['distribution'] = 'OpenBSD'
+            self.facts['distribution_release'] = platform.release()
+            rc, out, err = module.run_command("/sbin/sysctl -n kern.version")
+            data = re.search('OpenBSD\s[0-9]+.[0-9]+(-\S+)?\s.*', out)
+            if data:
+                self.facts['distribution_version'] = data.groups()[0][1:]
+            else:
+                self.facts['distribution_version'] = 'release'
         else:
             dist = platform.dist()
             self.facts['distribution'] = dist[0].capitalize() or 'NA'