only set the CN field when generating initial CSR to prevent issues with the php7 ppa version of openssl (#1223)

OpenSSL 1.1.0f now validates the other subject fields and rejects the empty string (for the country?) because it isn't two characters.

setup/ssl.sh

@@ -74,7 +74,7 @@ if [ ! -f $STORAGE_ROOT/ssl/ssl_certificate.pem ]; then
 	CSR=/tmp/ssl_cert_sign_req-$$.csr
 	hide_output \
 	openssl req -new -key $STORAGE_ROOT/ssl/ssl_private_key.pem -out $CSR \
-	  -sha256 -subj "/C=/ST=/L=/O=/CN=$PRIMARY_HOSTNAME"
+	  -sha256 -subj "/CN=$PRIMARY_HOSTNAME"
 
 	# Generate the self-signed certificate.
 	CERT=$STORAGE_ROOT/ssl/$PRIMARY_HOSTNAME-selfsigned-$(date --rfc-3339=date | sed s/-//g).pem