Added defaults for ArchLinux in map.jinja

chrony/map.jinja

                      'logchange 0.5',
                      ],
     },
+    'Arch': {
+      'package':     'chrony',
+      'service':     'chrony',
+      'config':      '/etc/chrony.conf',
+      'config_src':  'salt://chrony/files/chrony_config',
+      'options':     'iburst',
+      'logdir':      '/var/log/chrony',
+      'keyfile':     '/etc/chrony.keys',
+      'driftfile':   '/var/lib/chrony/drift',
+      'otherparams': [
+                     'rtconutc',
+                     'rtcsync',
+                     ],
+    }
   },
   grain='os_family',
   merge=salt['pillar.get']('chrony:config'))