Add test for recordpadding

Just run the quicapitest (which attempts to create quic connections)
while using a config that specifies recordpadding, which quic should
ignore

Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28992)

test/default-recordpadding.cnf

@@ -0,0 +1,27 @@
+openssl_conf = openssl_init
+
+# Comment out the next line to ignore configuration errors
+config_diagnostics = 1
+
+[openssl_init]
+providers = provider_sect
+ssl_conf = ssl_section
+
+[ssl_section]
+system_default = system_default_section
+
+# Set block and record padding
+# Note: QUIC objects should ignore this, as they
+# always pad during datagram encryption
+[system_default_section]
+RecordPadding = 128,256
+
+[provider_sect]
+default = default_sect
+legacy  = legacy_sect
+
+[default_sect]
+activate = true
+
+[legacy_sect]
+activate = false

test/recipes/75-test_quicapi.t

@@ -30,7 +30,7 @@ plan tests =>
     + 1;                        # quicapitest with default provider
 
 ok(run(test(["quicapitest", "default",
-             srctop_file("test", "default.cnf"),
+             srctop_file("test", "default-recordpadding.cnf"),
              srctop_dir("test", "certs"),
              srctop_dir("test", "recipes", "75-test_quicapi_data")])),
              "running quicapitest");