[Libguestfs] [PATCH nbdkit] locks: Remove debugging messages about

The messages are not really useful to us, but they do bloat the debugging output of virt-v2v massively: nbdkit: python[1]: debug: acquire global request lock nbdkit: python[1]: debug: acquire per-connection request lock nbdkit: python[1]: debug: acquire unload prevention lock nbdkit: python[1]: debug: pwrite count=2097152 offset=4628414464 fua=0 nbdkit: python[1]: debug: release unload prevention lock nbdkit: python[1]: debug: release per-connection request lock nbdkit: python[1]: debug: release global request lock We probably need some kind of level of verbosity to deal with this sort of thing, but that's quite a large change. Rich.