VMware: Add fix for setting manual MAC address (#32885)

This fix adds ability to set MAC address maunally. Before adding
any MAC address, the value is validated. If value is not valid, then
MAC address is set to vCenter generated MAC address.
Also, added integration tests for this change.

Fixes: #21161

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/cloud/vmware/vmware_guest.py

@@ -313,6 +313,7 @@ instance:
     sample: None
 '''
 
+import re
 import time
 
 HAS_PYVMOMI = False
@@ -470,14 +471,29 @@ class PyVmomiDeviceHelper(object):
         nic.device.connectable.startConnected = True
         nic.device.connectable.allowGuestControl = True
         nic.device.connectable.connected = True
-        if 'mac' in device_infos:
-            nic.device.addressType = 'assigned'
+        if 'mac' in device_infos and self.is_valid_mac_addr(device_infos['mac']):
+            nic.device.addressType = 'manual'
             nic.device.macAddress = device_infos['mac']
         else:
             nic.device.addressType = 'generated'
 
         return nic
 
+    @staticmethod
+    def is_valid_mac_addr(mac_addr):
+        """
+        Function to validate MAC address for given string
+        Args:
+            mac_addr: string to validate as MAC address
+
+        Returns: (Boolean) True if string is valid MAC address, otherwise False
+        """
+        ret = False
+        mac_addr_regex = re.compile('[0-9a-f]{2}([-:])[0-9a-f]{2}(\\1[0-9a-f]{2}){4}$')
+        if mac_addr_regex.match(mac_addr):
+            ret = True
+        return ret
+
 
 class PyVmomiCache(object):
     """ This class caches references to objects which are requested multiples times but not modified """