Update Unknown error to specific error message (ansible#50129)

* Update `Unknown error` to specific error message

outputs the Exception received rather than just 'Unknown error'
fixes: issue/49713

* Update `Unknown error` to specific error message

improves the error message

lib/ansible/module_utils/redfish_utils.py

@@ -7,6 +7,7 @@
 import json
 import re
 from ansible.module_utils.urls import open_url
+from ansible.module_utils._text import to_text
 from ansible.module_utils.six.moves.urllib.error import URLError, HTTPError
 
 HEADERS = {'content-type': 'application/json'}
@@ -35,8 +36,9 @@ def get_request(self, uri):
         except URLError as e:
             return {'ret': False, 'msg': "URL Error: %s" % e.reason}
         # Almost all errors should be caught above, but just in case
-        except Exception:
-            return {'ret': False, 'msg': "Unknown error"}
+        except Exception as e:
+            return {'ret': False,
+                    'msg': 'Failed GET operation against Redfish API server: %s' % to_text(e)}
         return {'ret': True, 'data': data}
 
     def post_request(self, uri, pyld, hdrs):
@@ -53,8 +55,9 @@ def post_request(self, uri, pyld, hdrs):
         except URLError as e:
             return {'ret': False, 'msg': "URL Error: %s" % e.reason}
         # Almost all errors should be caught above, but just in case
-        except Exception:
-            return {'ret': False, 'msg': "Unknown error"}
+        except Exception as e:
+            return {'ret': False,
+                    'msg': 'Failed POST operation against Redfish API server: %s' % to_text(e)}
         return {'ret': True, 'resp': resp}
 
     def patch_request(self, uri, pyld, hdrs):
@@ -71,8 +74,9 @@ def patch_request(self, uri, pyld, hdrs):
         except URLError as e:
             return {'ret': False, 'msg': "URL Error: %s" % e.reason}
         # Almost all errors should be caught above, but just in case
-        except Exception:
-            return {'ret': False, 'msg': "Unknown error"}
+        except Exception as e:
+            return {'ret': False,
+                    'msg': 'Failed PATCH operation against Redfish API server: %s' % to_text(e)}
         return {'ret': True, 'resp': resp}
 
     def delete_request(self, uri, pyld, hdrs):
@@ -89,8 +93,9 @@ def delete_request(self, uri, pyld, hdrs):
         except URLError as e:
             return {'ret': False, 'msg': "URL Error: %s" % e.reason}
         # Almost all errors should be caught above, but just in case
-        except Exception:
-            return {'ret': False, 'msg': "Unknown error"}
+        except Exception as e:
+            return {'ret': False,
+                    'msg': 'Failed DELETE operation against Redfish API server: %s' % to_text(e)}
         return {'ret': True, 'resp': resp}
 
     def _init_session(self):