pgbouncer - pgbouncer: rename disable_varcache to track_parameters

Log Message:
-----------
rename disable_varcache to track_parameters

Modified Files:
--------------
pgbouncer/src:
bouncer.h (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/bouncer.h.diff?r1=1.14&r2=1.15)
main.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/main.c.diff?r1=1.12&r2=1.13)
objects.c (r1.21 -> r1.22)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/objects.c.diff?r1=1.21&r2=1.22)