vdagent: replace last call to g_debug(...) by syslog(LOG_DEBUG, ...)
Fixes #21 (closed) by avoiding to set G_MESSAGES_DEBUG=all
to learn that the
vdagent failed to load because of missing virtio channel.
If the debug flag is not set, the vdagent remains silent, as defined with 149bba91 / #12 (closed).
Signed-off-by: Kevin Pouget kpouget@redhat.com