Undercloud: Remove deprecated/removed IPv6 parameters

- The NovaIPv6 parameter existed in old releases such as Newton but it
  was removed before Queens.

- RabbitIPv6, MemcachedIPv6, RedisIPv6 and MysqlIPv6 are all deprecated
  and have no effect now[1].

- The IronicIpVersion parameter was already deprecated and has had no
  effect since then[2].

[1] a03f33a7d4bcae0cacc0bd904f35e78935e24599
[2] 716492274ebd8b6674e72c7f568656362030c093

Change-Id: Id4647c734ed06ce98b83792da8cfaf761af8a631

tripleoclient/tests/v1/undercloud/test_config.py

@@ -215,12 +215,6 @@ class TestNetworkSettings(TestBaseNetworkSettings):
                          group='ctlplane-subnet')
         undercloud_config._process_network_args(env)
         expected = {
-            'NovaIPv6': True,
-            'RabbitIPv6': True,
-            'MemcachedIPv6': True,
-            'RedisIPv6': True,
-            'MysqlIPv6': True,
-            'IronicIpVersion': '6',
             'ControlPlaneStaticRoutes': [],
             'IronicInspectorSubnets': [
                 {'gateway': 'fd12:3456:789a:1::1',
@@ -265,12 +259,6 @@ class TestNetworkSettings(TestBaseNetworkSettings):
                          group='ctlplane-subnet')
         undercloud_config._process_network_args(env)
         expected = {
-            'NovaIPv6': True,
-            'RabbitIPv6': True,
-            'MemcachedIPv6': True,
-            'RedisIPv6': True,
-            'MysqlIPv6': True,
-            'IronicIpVersion': '6',
             'ControlPlaneStaticRoutes': [],
             'IronicInspectorSubnets': [
                 {'gateway': 'fd12:3456:789a:1::1',

tripleoclient/v1/undercloud_config.py

@@ -390,13 +390,6 @@ def _process_network_args(env):
                                               'Please provide less than 6 '
                                               'servers in undercloud_'
                                               'nameservers.')
-    if netaddr.IPNetwork(CONF['local_ip']).version == 6:
-        env['NovaIPv6'] = True
-        env['RabbitIPv6'] = True
-        env['MemcachedIPv6'] = True
-        env['RedisIPv6'] = True
-        env['MysqlIPv6'] = True
-        env['IronicIpVersion'] = '6'
 
     # We do not use undercloud ips for env, but just validate the configured
     # value here.