Lock Watcher missing for deletes of Locked files

[dragotin]

Testcase:

• Create a directory and put a Libre Office (LO) file in. Let that sync to the server. Open the file in LO to lock it.
• Remove the directory on the server side completely.

What is expected:

1. For the case where the file was not modified locally, the client should remove the file and directory. That is happening (ok) but only on force-sync. That means that there is no lock watcher enabled in this case that checks the file regularly.
2. For the case where the file was modified locally, the client should upload the changed file and not remove the dir. That is not the case. The client removes the file even when the file was modified.

That shows two bugs:

1. There should be a log watcher for deletes that failed due to lock that automatically.
2. Before propagating the remove from remote to local, it needs to be checked if the file was modified, and if, the file should be uploaded to not loose the changes. @hodyroff pls. acknowledge.