TrackerEvolutionPlugin: Send sparql updates without waiting for reply.
TrackerEvolutionPlugin: Send sparql updates without waiting for reply.

The number of DBus messages send may be huge, and it may take long for them to
be answered, clobbering the pending calls hashtable. This fixes some random
OOM observed when sending ~30K messages.

hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker