nmcli: Introduce IPIP Tunnel (#45933)

This work enables to add ipip tunnel via nmcli module

```
  - nmcli:
       state: present
       type: ipip
       conn_name: ipip_test1
       autoconnect: yes
       ip_tunnel_dev: enp0s8
       ip_tunnel_local: 192.168.1.2
       ip_tunnel_remote: 192.168.1.5
```

version2: Added tests
Signed-off-by: Susant Sahani <susant@redhat.com>

Rebase

test/units/modules/net_tools/test_nmcli.py

@@ -58,6 +58,13 @@ TESTCASE_CONNECTION = [
         'state': 'absent',
         '_ansible_check_mode': True,
     },
+    {
+        'type': 'ipip',
+        'conn_name': 'non_existent_nw_device',
+        'state': 'absent',
+        '_ansible_check_mode': True,
+    },
+
 ]
 
 TESTCASE_GENERIC = [
@@ -150,6 +157,19 @@ TESTCASE_VXLAN = [
     }
 ]
 
+TESTCASE_IPIP = [
+    {
+        'type': 'ipip',
+        'conn_name': 'non_existent_nw_device',
+        'ifname': 'ipip-existent_nw_device',
+        'ip_tunnel_dev': 'non_existent_ipip_device',
+        'ip_tunnel_local': '192.168.225.5',
+        'ip_tunnel_remote': '192.168.225.6',
+        'state': 'present',
+        '_ansible_check_mode': False,
+    }
+]
+
 TESTCASE_ETHERNET_DHCP = [
     {
         'type': 'ethernet',
@@ -500,6 +520,57 @@ def test_vxlan_mod(mocked_generic_connection_modify):
         assert param in args[0]
 
 
+@pytest.mark.parametrize('patch_ansible_module', TESTCASE_IPIP, indirect=['patch_ansible_module'])
+def test_create_ipip(mocked_generic_connection_create):
+    """
+    Test if ipip created
+    """
+    with pytest.raises(SystemExit):
+        nmcli.main()
+
+    assert nmcli.Nmcli.execute_command.call_count == 1
+    arg_list = nmcli.Nmcli.execute_command.call_args_list
+    args, kwargs = arg_list[0]
+
+    assert args[0][0] == '/usr/bin/nmcli'
+    assert args[0][1] == 'con'
+    assert args[0][2] == 'add'
+    assert args[0][3] == 'type'
+    assert args[0][4] == 'ip-tunnel'
+    assert args[0][5] == 'mode'
+    assert args[0][6] == 'ipip'
+    assert args[0][7] == 'con-name'
+    assert args[0][8] == 'non_existent_nw_device'
+    assert args[0][9] == 'ifname'
+    assert args[0][10] == 'ipip-existent_nw_device'
+    assert args[0][11] == 'dev'
+    assert args[0][12] == 'non_existent_ipip_device'
+
+    for param in ['ip-tunnel.local', '192.168.225.5', 'ip-tunnel.remote', '192.168.225.6']:
+        assert param in args[0]
+
+
+@pytest.mark.parametrize('patch_ansible_module', TESTCASE_IPIP, indirect=['patch_ansible_module'])
+def test_ipip_mod(mocked_generic_connection_modify):
+    """
+    Test if ipip modified
+    """
+    with pytest.raises(SystemExit):
+        nmcli.main()
+
+    assert nmcli.Nmcli.execute_command.call_count == 1
+    arg_list = nmcli.Nmcli.execute_command.call_args_list
+    args, kwargs = arg_list[0]
+
+    assert args[0][0] == '/usr/bin/nmcli'
+    assert args[0][1] == 'con'
+    assert args[0][2] == 'mod'
+    assert args[0][3] == 'non_existent_nw_device'
+
+    for param in ['ip-tunnel.local', '192.168.225.5', 'ip-tunnel.remote', '192.168.225.6']:
+        assert param in args[0]
+
+
 @pytest.mark.parametrize('patch_ansible_module', TESTCASE_ETHERNET_DHCP, indirect=['patch_ansible_module'])
 def test_eth_dhcp_client_id_con_create(mocked_generic_connection_create):
     """