clientIF: strip unneeded logging

Everything we log inside clientIF.createVm is either
redundant or with little value.

Highlights
* if we need to debug vmContainerLock, there are better
  and more comprehensive ways to do that
* no need to log error, it should be reported anyway.

So this patch strips all the logging from this method.

Change-Id: I0c5bf3c85d105885ae5eee5024ae2f0b9f69f4f7
Signed-off-by: Francesco Romani <fromani@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34872
Reviewed-by: Dan Kenigsberg <danken@redhat.com>