t5702: use test_commit_bulk

There are two loops that create 32 commits each using test_commit. Using
test_commit_bulk speeds this up from:

  Benchmark #1: ./t5702-protocol-v2.sh --root=/var/ram/git-tests
    Time (mean ± σ):      5.409 s ±  0.513 s    [User: 2.382 s, System: 2.466 s]
    Range (min … max):    4.633 s …  5.927 s    10 runs

to:

  Benchmark #1: ./t5702-protocol-v2.sh --root=/var/ram/git-tests
    Time (mean ± σ):      3.956 s ±  0.242 s    [User: 1.775 s, System: 1.627 s]
    Range (min … max):    3.449 s …  4.239 s    10 runs

for an average savings of over 25%.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5702-protocol-v2.sh

@@ -499,10 +499,7 @@ test_expect_success 'upload-pack respects client shallows' '
 
 	# Add extra commits to the client so that the whole fetch takes more
 	# than 1 request (due to negotiation)
-	for i in $(test_seq 1 32)
-	do
-		test_commit -C client c$i
-	done &&
+	test_commit_bulk -C client --id=c 32 &&
 
 	git -C server checkout -b newbranch base &&
 	test_commit -C server client_wants &&
@@ -711,10 +708,7 @@ test_expect_success 'when server does not send "ready", expect FLUSH' '
 	# Create many commits to extend the negotiation phase across multiple
 	# requests, so that the server does not send "ready" in the first
 	# request.
-	for i in $(test_seq 1 32)
-	do
-		test_commit -C http_child c$i
-	done &&
+	test_commit_bulk -C http_child --id=c 32 &&
 
 	# After the acknowledgments section, pretend that a DELIM
 	# (0001) was sent instead of a FLUSH (0000).