MB-27146: add err msg for non-KVnode cbstats calls

Instead of exiting with "mc_bin_client.ErrorKeyEnoent: Memcached error #1:
KEY_ENOENT : Not Found :" any time a cbstats call is executed against a
node that is not running the Data (KV) Service, catch and specifically
handle this error - printing a more user-friendly error message.

Change-Id: I26f41ed3ec4f14fa5259bc182978503a8e872c4c
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/172296
Tested-by: Build Bot <[email protected]>
Reviewed-by: Dave Rigby <[email protected]>

Author: redm2

engines/ep/management/cli_auth_utils.py

@@ -110,6 +110,10 @@ def g(*args, **kwargs):
             print("No access to bucket:{0} - permission denied "
                   "or bucket does not exist.".format(bucket))
             sys.exit(1)
+        except mc_bin_client.ErrorKeyEnoent:
+            print(
+                "Error: bucket:{0} was not found - is this node running the Data Service?".format(bucket))
+            sys.exit(1)
 
     return g
 

engines/ep/management/clitool.py

@@ -88,7 +88,7 @@ def execute(self):
             if type(e) is tuple and e[0] == 32 or \
                     isinstance(e, socket.error) and e.errno == 32:
                 print("Could not connect to %s:%d: "
-                    "Connection refused" % (host, port), file=sys.stderr)
+                      "Connection refused" % (host, port), file=sys.stderr)
             else:
                 raise