Increase test size for migrating large values

Previously, the old test ran 5,000 loops and used about 500k.

With quicklist, storing those same 5,000 loops takes up 24k, so the
"large value check" failed!

This increases the test to 20,000 loops which makes the object dump 96k.

Author: mattsta

tests/unit/dump.tcl

@@ -157,7 +157,7 @@ start_server {tags {"dump"}} {
     test {MIGRATE can correctly transfer large values} {
         set first [srv 0 client]
         r del key
-        for {set j 0} {$j < 5000} {incr j} {
+        for {set j 0} {$j < 40000} {incr j} {
             r rpush key 1 2 3 4 5 6 7 8 9 10
             r rpush key "item 1" "item 2" "item 3" "item 4" "item 5" \
                         "item 6" "item 7" "item 8" "item 9" "item 10"
@@ -175,7 +175,7 @@ start_server {tags {"dump"}} {
             assert {[$first exists key] == 0}
             assert {[$second exists key] == 1}
             assert {[$second ttl key] == -1}
-            assert {[$second llen key] == 5000*20}
+            assert {[$second llen key] == 40000*20}
         }
     }