Added osrelease and osversion as well as changed the way sysctl is called on OSX

setup

@@ -855,36 +855,49 @@ class AIX(Hardware):
 class Darwin(Hardware):
    """
    Darwin-specific subclass of Hardware.  Defines memory and CPU facts:
+   - processor
    - processor_cores
    - memtotal_mb
    - memfree_mb
+   - model
+   - osversion
+   - osrevision
    """
    platform = 'Darwin'
 
    def __init__(self):
-       Hardware.__init__(self)
+        Hardware.__init__(self)
 
    def populate(self):
+        self.sysctl = self.get_sysctl()
+        self.get_mac_facts()
         self.get_cpu_facts()
         self.get_memory_facts()
         return self.facts
 
+   def get_sysctl(self):
+        rc, out, err = module.run_command(["/usr/sbin/sysctl", "hw", "machdep", "kern"])
+        if rc != 0:
+            return dict()
+        sysctl = dict()
+        for line in out.splitlines():
+            if line.rstrip("\n"):
+                (key, value) = re.split(' = |: ', line, maxsplit=1)
+                sysctl[key] = value.strip()
+        return sysctl
+
+   def get_mac_facts(self):
+        self.facts['model'] = self.sysctl['hw.model']
+        self.facts['osversion'] = self.sysctl['kern.osversion']
+        self.facts['osrevision'] = self.sysctl['kern.osrevision']
+
    def get_cpu_facts(self):
-        self.facts['processor'] = []
+        self.facts['processor'] = self.sysctl['machdep.cpu.brand_string']
-        rc, out, err = module.run_command("/usr/sbin/sysctl machdep.cpu.brand_string")
+        self.facts['processor_cores'] = self.sysctl['machdep.cpu.core_count']
-        data = out[:-1].split(': ')
-        self.facts['processor'] = data[1]
-        rc, out, err = module.run_command("/usr/sbin/sysctl machdep.cpu.core_count")
-        data = out[:-1].split(': ')
-        self.facts['processor_cores'] = data[1]
 
    def get_memory_facts(self):
-        rc, out, err = module.run_command("/usr/sbin/sysctl hw.memsize")
+        self.facts['memtotal_mb'] = long(self.sysctl['hw.memsize']) / 1024 / 1024
-        data = out[:-1].split(': ')
+        self.facts['memfree_mb'] = long(self.sysctl['hw.usermem']) / 1024 / 1024
-        self.facts['memtotal_mb'] = int(data[1]) / 1024 / 1024
-        rc, out, err = module.run_command("/usr/sbin/sysctl hw.usermem")
-        data = out[:-1].split(': ')
-        self.facts['memfree_mb'] = int(data[1]) / 1024 / 1024
 
 class Network(Facts):
     """