test: add make-certs script to generate SSL certs

This will create the a certificate authority (CA) and then create
a cert for composer and another one for the worker. The worker
one can also be used by the koji plugin.
The configuration file is needed to get subjectAltName working.

test/data/composer.ssl.conf

@@ -0,0 +1,17 @@
+[req]
+distinguished_name = req_distinguished_name
+req_extensions = v3_req
+prompt = no
+
+[req_distinguished_name]
+CN = localhost
+
+[v3_req]
+keyUsage = critical,keyEncipherment, dataEncipherment, digitalSignature
+extendedKeyUsage = critical,serverAuth,clientAuth,emailProtection
+basicConstraints = critical,CA:FALSE
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = localhost
+DNS.2 = composer