Fix documentation comments for test CA config files

The config files which are used to generate the server and client
CAs claimed that these were self-signed, when they in reality are
signed by the root_ca (which however is self-signed).  Reword the
comments to match.

Author: David Zhang <david.zhang@highgo.ca>
Discussion: https://postgr.es/m/12f4c425-45fe-480f-a692-b3ed82ebcb33@highgo.ca

src/test/ssl/conf/client_ca.config

@@ -1,7 +1,9 @@
-# An OpenSSL format CSR config file for creating the client root certificate.
-# This configuration file is also used when operating the CA.
+# An OpenSSL format CSR config file for creating the client Intermediate
+# Certificate Authority. This configuration file is also used when operating
+# the CA.
 #
-# This certificate is used to sign client certificates. It is self-signed.
+# This certificate is used to sign client certificates. It is an Intermediate
+# CA.
 
 [ req ]
 distinguished_name     = req_distinguished_name

src/test/ssl/conf/root_ca.config

@@ -1,5 +1,5 @@
 # A root certificate authority. The server and client CA's certificates
-# are signed by this root CA.
+# are signed by this root CA. This certificate is self-signed.
 
 [ req ]
 distinguished_name     = req_distinguished_name

src/test/ssl/conf/server_ca.config

@@ -1,7 +1,9 @@
-# An OpenSSL format CSR config file for creating the server root certificate.
-# This configuration file is also used when operating the CA.
+# An OpenSSL format CSR config file for creating the server Intermediate
+# Certificate Authority. This configuration file is also used when operating
+# the CA.
 #
-# This certificate is used to sign server certificates. It is self-signed.
+# This certificate is used to sign server certificates. It is an Intermediate
+# CA.
 
 [ req ]
 distinguished_name     = req_distinguished_name