small patch to fact gathering for when no dmesg.boot exists on freebsd, mainly happens in jails

Signed-off-by: Brian Coca <briancoca+ansible@gmail.com>

setup

@@ -438,13 +438,22 @@ class FreeBSDHardware(Hardware):
                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         out, err = cmd.communicate()
         self.facts['processor_count'] = out.strip()
-        for line in open(FreeBSDHardware.DMESG_BOOT).readlines():
+
+        try:
+            dmesg_boot = open(FreeBSDHardware.DMESG_BOOT)
+        except IOError:
+            dmesg_cmd = subprocess.Popen("/sbin/dmesg", shell=True,
+                               stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            dmesg_boot,dmesg_err = dmesg_cmd.communicate()
+
+        for line in dmesg_boot.readlines():
             if 'CPU:' in line:
                 cpu = re.sub(r'CPU:\s+', r"", line)
                 self.facts['processor'].append(cpu.strip())
             if 'Logical CPUs per core' in line:
                 self.facts['processor_cores'] = line.split()[4]
 
+
     def get_memory_facts(self):
         cmd = subprocess.Popen("/sbin/sysctl vm.stats", shell=True,
                                stdout=subprocess.PIPE, stderr=subprocess.PIPE)