Fix vrf parsing in eos_vrf and eos_eapi module (#35791)

* Fix vrf parsing in eos_vrf and eos_eapi module

Fixes #30250

Fix logic to parse vrf when interface value in `show vrf`
command output spans on multiple lines

* Add idempotent test case

lib/ansible/modules/network/eos/eos_eapi.py

@@ -213,7 +213,15 @@ def validate_local_http_port(value, module):
 
 def validate_vrf(value, module):
     out = run_commands(module, ['show vrf'])
-    configured_vrfs = re.findall(r'^\s+(\w+)(?=\s)', out[0], re.M)
+    configured_vrfs = []
+    lines = out[0].strip().splitlines()[3:]
+    for l in lines:
+        if not l:
+            continue
+        splitted_line = re.split(r'\s{2,}', l.strip())
+        if len(splitted_line) > 2:
+            configured_vrfs.append(splitted_line[0])
+
     configured_vrfs.append('default')
     if value not in configured_vrfs:
         module.fail_json(msg='vrf `%s` is not configured on the system' % value)