plproxy - plproxy: If query is canceled by user, send cancel request to

Log Message:
-----------
If query is canceled by user, send cancel request
to remote databases too.

Patch by Ye Wenbin

Modified Files:
--------------
plproxy/src:
execute.c (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plproxy/plproxy/src/execute.c.diff?r1=1.14&r2=1.15)