python: ConfigParser did not accept dns-fallback-google and persist-tun overrides

These two override flags was not listed among the accepted list of
override values.  And they were also not properly documented.

The 'persist-tun' override isn't strictly needed, since the --perist-tun
option is converted into such an override.  But it enables a possibility
to disable it.

Signed-off-by: David Sommerseth <[email protected]>

Author: dsommers

docs/man/openvpn2.1.rst

@@ -191,6 +191,9 @@ OPTIONS
                           Override connection protocol.
                           Valid values: :code:`tcp` or :code:`udp`
 
+                      :code:`persist-tun`
+                          Alternative approach to set `--persist-tun`.
+
                       :code:`ipv6`
                           Enable or disable IPv6 inside the tunnel.
                           Valid values: :code:`yes`, :code:`no` or :code:`default`
@@ -204,6 +207,10 @@ OPTIONS
                           ``openvpn3-config-manage``\(1) for details.
                           Valid values: :code:`yes`, :code:`no` or :code:`asym`
 
+                      :code:`dns-fallback-google`
+                          If set to true, the DNS resolver settings will include
+                          Google DNS servers.
+
                       :code:`dns-setup-disabled`
                           Disable configuring pushed DNS settings.
                           Valid values: :code:`true` or :code:`false`

src/python/openvpn3/ConfigParser.py

@@ -183,12 +183,13 @@ def __init_arguments(self):
         # in the generated configuration, but are profile settings
         # sent to the Configuration Manager separately
         profile_overrides = [
-            'server-override', 'port-override', 'proto-override',
-            'ipv6', 'dns-scope', 'dns-setup-disabled', 'dns-sync-lookup',
+            'server-override', 'port-override', 'proto-override', 'ipv6',
+            'dns-fallback-google', 'dns-scope',
+            'dns-setup-disabled', 'dns-sync-lookup',
             'auth-fail-retry', 'proxy-host', 'proxy-port',
             'proxy-username', 'proxy-password',
             'proxy-auth-cleartext', 'enable-legacy-algorithms',
-            'allow-compression']
+            'allow-compression', 'persist-tun']
 
         self.__parser.add_argument('--auth', metavar='ALG',
                                    action='store',