REGTESTS: ssl: add the same cert for client/server

Add the same certificate in server and bind line so we can try to catch
problems like in issue #1748 when updating over the CLI.

reg-tests/ssl/set_ssl_cafile.vtc

@@ -43,6 +43,8 @@ haproxy h1 -conf {
 
     listen clear-lst
         bind "fd@${clearlst}"
+       # dummy bind used to test a change when the same crt is used as server and bind
+        bind "fd@${foobarlst}" ssl crt ${testdir}/set_cafile_client.pem ca-file ${testdir}/set_cafile_interCA1.crt verify none
         server s1 "${tmpdir}/ssl.sock" ssl crt ${testdir}/set_cafile_client.pem ca-file ${testdir}/set_cafile_interCA1.crt verify none
 
     listen clear-verified-lst

reg-tests/ssl/set_ssl_cert.vtc

@@ -69,6 +69,8 @@ haproxy h1 -conf {
     listen ssl-lst
         bind "${tmpdir}/ssl.sock" ssl crt ${testdir}/common.pem strict-sni
         server s1 ${s1_addr}:${s1_port}
+	# dummy server used to test a change when the same crt is used as server and bind
+        server s2 ${s1_addr}:${s1_port} ssl crt ${testdir}/common.pem verify none weight 0
 
     listen other-ssl-lst
         bind "${tmpdir}/other-ssl.sock" ssl crt-list ${testdir}/set_default_cert.crt-list