setting thread_pool_timeout is useless because vtc_mode overrides

the herder delay to .5 seconds anyway

bin/varnishtest/tests/r01490.vtc

@@ -9,7 +9,6 @@ varnish v1 \
 	-arg "-p thread_pool_min=2" \
 	-arg "-p thread_pool_max=3" \
 	-arg "-p thread_pools=1" \
-	-arg "-p thread_pool_timeout=10" \
 	-vcl+backend {}
 varnish v1 -start
 
@@ -24,16 +23,16 @@ logexpect l1 -v v1 -g raw {
 
 varnish v1 -cliok "param.set thread_pool_min 3"
 
-# Have to wait longer than thread_pool_timeout
-delay 11
+# thread_pool_timeout overridden by vtc_mode with delay=0.5
+delay 1
 
 varnish v1 -expect threads == 3
 
 varnish v1 -cliok "param.set thread_pool_min 2"
 varnish v1 -cliok "param.set thread_pool_max 2"
 
-# Have to wait longer than thread_pool_timeout
-delay 11
+# thread_pool_timeout overridden by vtc_mode with delay=0.5
+delay 1
 
 varnish v1 -expect threads == 2