add normalize_interface in module_utils and fix nxos_l3_interface module (#40598)

Signed-off-by: Trishna Guha <trishnaguha17@gmail.com>

lib/ansible/module_utils/network/nxos/nxos.py

@@ -439,3 +439,43 @@ def load_config(module, config, return_error=False, opts=None):
 def get_capabilities(module):
     conn = get_connection(module)
     return conn.get_capabilities()
+
+
+def normalize_interface(name):
+    """Return the normalized interface name
+    """
+    if not name:
+        return
+
+    def _get_number(name):
+        digits = ''
+        for char in name:
+            if char.isdigit() or char in '/.':
+                digits += char
+        return digits
+
+    if name.lower().startswith('et'):
+        if_type = 'Ethernet'
+    elif name.lower().startswith('vl'):
+        if_type = 'Vlan'
+    elif name.lower().startswith('lo'):
+        if_type = 'loopback'
+    elif name.lower().startswith('po'):
+        if_type = 'port-channel'
+    elif name.lower().startswith('nv'):
+        if_type = 'nve'
+    else:
+        if_type = None
+
+    number_list = name.split(' ')
+    if len(number_list) == 2:
+        number = number_list[-1].strip()
+    else:
+        number = _get_number(name)
+
+    if if_type:
+        proper_interface = if_type + number
+    else:
+        proper_interface = name
+
+    return proper_interface