Add ip4_hex filter to convert ip-address to hex notation

lib/ansible/plugins/filter/ipaddr.py

@@ -670,7 +670,11 @@ def _need_netaddr(f_name, *args, **kwargs):
     raise errors.AnsibleFilterError('The {0} filter requires python-netaddr be'
             ' installed on the ansible controller'.format(f_name))
 
-# ---- Ansible filters ----
+def ip4_hex(arg):
+    ''' Convert an IPv4 address to Hexadecimal notation '''
+    numbers = list(map(int, arg.split('.')))
+    return '{:02x}{:02x}{:02x}{:02x}'.format(*numbers)
+
 
 class FilterModule(object):
     ''' IP address and network manipulation filters '''
@@ -683,6 +687,7 @@ class FilterModule(object):
         'ipsubnet': ipsubnet,
         'nthhost': nthhost,
         'slaac': slaac,
+        'ip4_hex': ip4_hex,
 
         # MAC / HW addresses
         'hwaddr': hwaddr,