eos handles error gracefully when maximum sessions is reached (#41242)

* to resolve #36977

* to resolve #36977

* fix review comment

lib/ansible/module_utils/network/eos/eos.py

@@ -205,7 +205,7 @@ class Cli:
             return conn.load_config(commands, commit, replace)
         except ConnectionError as exc:
             message = getattr(exc, 'err', exc)
-            self._module.fail_json(msg="Error on executing commands %s" % commands, data=to_text(message, errors='surrogate_then_replace'))
+            self._module.fail_json(msg="%s" % message, data=to_text(message, errors='surrogate_then_replace'))
 
 
 class Eapi:

lib/ansible/plugins/terminal/eos.py

@@ -45,7 +45,8 @@ class TerminalModule(TerminalBase):
         re.compile(br"[^\r\n]+ not found", re.I),
         re.compile(br"'[^']' +returned error code: ?\d+"),
         re.compile(br"[^\r\n]\/bin\/(?:ba)?sh"),
-        re.compile(br"% More than \d+ OSPF instance", re.I)
+        re.compile(br"% More than \d+ OSPF instance", re.I),
+        re.compile(br"Maximum number of pending sessions has been reached")
     ]
 
     def on_open_shell(self):