cmdlib: Change wording of messages during disk wipe

Error messages don't need to say “please” and it's already obvious some
investigation is needed. LogWarning already logs the message using
“logging.error” internally.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Bernardo Dal Seno <bdalseno@google.com>

lib/cmdlib.py

@@ -8987,16 +8987,17 @@ def _WipeDisks(lu, instance):
   for device in instance.disks:
     lu.cfg.SetDiskID(device, node)
-  logging.info("Pause sync of instance %s disks", instance.name)
+  logging.info("Pausing synchronization of disks of instance '%s'",
+               instance.name)
   result = lu.rpc.call_blockdev_pause_resume_sync(node,
                                                   (instance.disks, instance),
                                                   True)
-  result.Raise("Failed RPC to node %s for pausing the disk syncing" % node)
+  result.Raise("Failed to pause disk synchronization on node '%s'" % node)
   for idx, success in enumerate(result.payload):
     if not success:
-      logging.warn("pause-sync of instance %s for disks %d failed",
-                   instance.name, idx)
+      logging.warn("Pausing synchronization of disk %s of instance '%s'"
+                   " failed", idx, instance.name)
   try:
     for idx, device in enumerate(instance.disks):
@@ -9009,7 +9010,7 @@ def _WipeDisks(lu, instance):
       wipe_chunk_size = int(wipe_chunk_size)
       lu.LogInfo("* Wiping disk %d", idx)
-      logging.info("Wiping disk %d for instance %s, node %s using"
+      logging.info("Wiping disk %d for instance %s on node %s using"
                    " chunk size %s", idx, instance.name, node, wipe_chunk_size)
       offset = 0
@@ -9033,23 +9034,21 @@ def _WipeDisks(lu, instance):
                      (offset / float(size) * 100, utils.FormatSeconds(eta)))
           last_output = now
   finally:
-    logging.info("Resume sync of instance %s disks", instance.name)
+    logging.info("Resuming synchronization of disks for instance '%s'",
+                 instance.name)
     result = lu.rpc.call_blockdev_pause_resume_sync(node,
                                                     (instance.disks, instance),
                                                     False)
     if result.fail_msg:
-      lu.LogWarning("RPC call to %s for resuming disk syncing failed,"
-                    " please have a look at the status and troubleshoot"
-                    " the issue: %s", node, result.fail_msg)
+      lu.LogWarning("Failed to resume disk synchronization on node '%s': %s",
+                    node, result.fail_msg)
     else:
       for idx, success in enumerate(result.payload):
         if not success:
-          lu.LogWarning("Resume sync of disk %d failed, please have a"
-                        " look at the status and troubleshoot the issue", idx)
-          logging.warn("resume-sync of instance %s for disks %d failed",
-                       instance.name, idx)
+          lu.LogWarning("Resuming synchronization of disk %s of instance '%s'"
+                        " failed", idx, instance.name)
 def _CreateDisks(lu, instance, to_skip=None, target_node=None):