pgbouncer - pgbouncer: Rename sbuf_has_no_state() to sbuf_is_empty() As

Log Message:
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Rename sbuf_has_no_state() to sbuf_is_empty()

As its used now for more than just suspending, the old does not fit anymore.

Modified Files:
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pgbouncer/src:
janitor.c (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/janitor.c.diff?r1=1.5&r2=1.6)
objects.c (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/objects.c.diff?r1=1.5&r2=1.6)
sbuf.c (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/sbuf.c.diff?r1=1.4&r2=1.5)
sbuf.h (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/sbuf.h.diff?r1=1.3&r2=1.4)