Add scripts for generating certs to be used with the quic_server

net/tools/quic/certs/leaf.cnf

Index: net/tools/quic/certs/leaf.cnf
diff --git a/net/tools/quic/certs/leaf.cnf b/net/tools/quic/certs/leaf.cnf
new file mode 100644
index 0000000000000000000000000000000000000000..7a1f098b174c8654a947f72d91b8b8a07e5018cc
--- /dev/null
+++ b/net/tools/quic/certs/leaf.cnf
@@ -0,0 +1,27 @@
+SUBJECT_NAME = req_dn
+KEY_SIZE = 2048
+
+[req]
+default_bits       = ${ENV::KEY_SIZE}
+default_md         = sha256
+string_mask        = utf8only
+prompt             = no
+encrypt_key        = no
+distinguished_name = ${ENV::SUBJECT_NAME}
+req_extensions     = req_extensions
+
+[req_dn]
+C  = US
+ST = California
+L  = Mountain View
+O  = QUIC Server
+CN = 127.0.0.1
+
+[req_extensions]
+subjectAltName = @other_hosts
+
+[other_hosts]
+DNS.1 = www.example.org
+DNS.2 = mail.example.org
+DNS.3 = mail.example.com
+