Add recipes for tests related to certificates

Some of them make use of recipes/tconversion.pl.

Reviewed-by: Rich Salz <rsalz@openssl.org>

test/recipes/25-test_sid.t

diff --git a/test/recipes/25-test_sid.t b/test/recipes/25-test_sid.t
new file mode 100644
index 0000000..710eab4
--- /dev/null
+++ b/test/recipes/25-test_sid.t
@@ -0,0 +1,18 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use File::Spec;
+use Test::More;
+use OpenSSL::Test qw/:DEFAULT top_file/;
+
+setup("test_sid");
+
+plan tests => 2;
+
+require_ok(top_file('test','recipes','tconversion.pl'));
+
+subtest 'sid conversions' => sub {
+    tconversion("sid", top_file("test","testsid.pem"), "sess_id");
+};