bug #96742: RFE: rtcpd should be configurable as to whether or not it tries to reuse tape mounts

I have modified the log level of the following vdqmd daemon message in the trunk:

2012-08-13T19:37:48.108835+02:00 lxc2dev4 vdqmd[11998]: LVL=Warn TID=12009 MSG="client has requested a forced unmount." REQID=6b015ba7-6d26-403d-aa3c-8fdd36ce7cc5

I have changed the log level from DLF_LVL_WARNING to DLF_LVL_SYSTEM.  This is because the default rtcpd daemon behaviour after this RFE is to not try an reuse mounts across stagers.