cmd not terminating when resource is locked forever

[nickvergessen]

Currently writing smashbox tests for locking.

1. I created an artificial lock on a folder, which never expires.
2. Create a new file in that folder locally
3. Try to sync

Expected

The cmd terminates ❓

Actual

It never terminates,
From the sync log:

<<#### Post-Reconcile end ####################################################  214
file2.dat - server replied: Locked" QVariant(int, 423)
[...]
Restarting Sync, because another sync is needed

This happens forever.

Now I can see that it may be useful, to have the client retrying.
However it would be nice (for testing purpose) to have something like a --max-sync-retries settings, which then terminates the client, with an error exit code.

cc @guruz

[nickvergessen]

Tested and works, thanks!