qemu: Suppress error reporting from qemuMonitorDelObject in cleanup paths

qemu: Suppress error reporting from qemuMonitorDelObject in cleanup paths

Many calls of qemuMonitorDelObject don't actually check the return value
or report the error from the object deletion itself since they are on
cleanup paths. In some cases this can lead to reporting of spurious
errors e.g. when qemuMonitorDelObject is used to clean up a possibly
pre-existing objects.

Add a new argument for qemuMonitorDelObject which controls whether
the internals report errors from qemu and fix all callers accordingly.

Note that some of the cases on device unplug which check the error code
don't in fact propagate the error to the user, but in this case it is
important to add the log entry anyways for tracing that the device
deletion failed.

https://bugzilla.redhat.com/show_bug.cgi?id=1784040

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>