3131. [func] Improve scalability by allocating one zone task

per 100 zones at startup time, rather than using a
			fixed-size task table. [RT #24406]

bin/tests/startperf/smallzone.db

@@ -0,0 +1,17 @@
+$TTL 300	; 5 minutes
+@			IN SOA	mname1. . (
+				2000042407 ; serial
+				20         ; refresh (20 seconds)
+				20         ; retry (20 seconds)
+				1814400    ; expire (3 weeks)
+				3600       ; minimum (1 hour)
+				)
+			NS	ns
+ns			A	10.53.0.3
+
+a			A	10.0.0.1
+b			A	10.0.0.2
+d			A	10.0.0.4
+z			A	10.0.0.26
+a.a.a.a			A	10.0.0.3
+*.e			A	10.0.0.6