limit of getRange in snapTest reduced

With CLIENT_KNOBS->TOO_MANY in snapTest, by the time getRange
gathers all the results, the storage server's oldest version has
gone past the req->version and hence the transaction fails with
transaction_too_old

fdbserver/workloads/SnapTest.actor.cpp

@@ -275,7 +275,7 @@ public: // workload functions
 			tr.reset();
 			loop {
 				try {
-					Standalone<RangeResultRef> kvRange = wait(tr.getRange(begin, end, CLIENT_KNOBS->TOO_MANY));
+					Standalone<RangeResultRef> kvRange = wait(tr.getRange(begin, end, 1000));
 					if (!kvRange.more && kvRange.size() == 0) {
 						TraceEvent("SnapTestNoMoreEntries");
 						break;