t: silence output from test_create_repo()

There are a couple users of `test_create_repo()` that use this function
outside of any test case. This function is nowadays only a thin wrapper
around `git init`, which by default prints a message to stdout that the
repository has been initialized. The resulting output may thus confuse
TAP parsers.

Refactor these users to instead create the repository in a "setup" test
case so that we don't explicitly have to silence them. There's one
exception in t1007: we use `push_repo()` and its `pop_repo()` equivalent
multiple times, so to reduce the noise introduced by this patch we
instead silence this invocation.

While at it, convert callsites to use git-init(1) directly as the
`test_create_repo()` function has been deprecated in f0d4d398e2
(test-lib: split up and deprecate test_create_repo(), 2021-05-10).

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1007-hash-object.sh

@@ -30,7 +30,7 @@ setup_repo() {
 
 test_repo=test
 push_repo() {
-	test_create_repo $test_repo
+	git init --quiet $test_repo
 	cd $test_repo
 
 	setup_repo

t/t4041-diff-submodule-option.sh

@@ -48,11 +48,12 @@ commit_file () {
 	git commit "$@" -m "Commit $*" >/dev/null
 }
 
-test_create_repo sm1 &&
+test_expect_success 'setup submodule' '
-add_file . foo >/dev/null
+	git init sm1 &&
-
+	add_file . foo &&
-head1=$(add_file sm1 foo1 foo2)
+	head1=$(add_file sm1 foo1 foo2) &&
-fullhead1=$(cd sm1; git rev-parse --verify HEAD)
+	fullhead1=$(cd sm1 && git rev-parse --verify HEAD)
+'
 
 test_expect_success 'added submodule' '
 	git add sm1 &&
@@ -235,10 +236,13 @@ test_expect_success 'typechanged submodule(submodule->blob)' '
 	test_cmp expected actual
 '
 
-rm -f sm1 &&
+test_expect_success 'setup submodule anew' '
-test_create_repo sm1 &&
+	rm -f sm1 &&
-head6=$(add_file sm1 foo6 foo7)
+	git init sm1 &&
-fullhead6=$(cd sm1; git rev-parse --verify HEAD)
+	head6=$(add_file sm1 foo6 foo7) &&
+	fullhead6=$(cd sm1 && git rev-parse --verify HEAD)
+'
+
 test_expect_success 'nonexistent commit' '
 	git diff-index -p --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&

t/t4060-diff-submodule-option-diff-format.sh

@@ -363,9 +363,12 @@ test_expect_success 'typechanged submodule(submodule->blob)' '
 	diff_cmp expected actual
 '
 
-rm -f sm1 &&
+test_expect_success 'setup' '
-test_create_repo sm1 &&
+	rm -f sm1 &&
-head6=$(add_file sm1 foo6 foo7)
+	git init sm1 &&
+	head6=$(add_file sm1 foo6 foo7)
+'
+
 test_expect_success 'nonexistent commit' '
 	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&

t/t7401-submodule-summary.sh

@@ -38,10 +38,11 @@ commit_file () {
 	git commit "$@" -m "Commit $*" >/dev/null
 }
 
-test_create_repo sm1 &&
+test_expect_success 'setup submodule' '
-add_file . foo >/dev/null
+	git init sm1 &&
-
+	add_file . foo &&
-head1=$(add_file sm1 foo1 foo2)
+	head1=$(add_file sm1 foo1 foo2)
+'
 
 test_expect_success 'added submodule' "
 	git add sm1 &&
@@ -214,9 +215,12 @@ test_expect_success 'typechanged submodule(submodule->blob)' "
 	test_cmp expected actual
 "
 
-rm -f sm1 &&
+test_expect_success 'setup submodule' '
-test_create_repo sm1 &&
+	rm -f sm1 &&
-head6=$(add_file sm1 foo6 foo7)
+	git init sm1 &&
+	head6=$(add_file sm1 foo6 foo7)
+'
+
 test_expect_success 'nonexistent commit' "
 	git submodule summary >actual &&
 	cat >expected <<-EOF &&