Switch TLS tests to TLSv1.2+ only

This would more likely match a relevant production deployment.

Change-Id: I4ee2ff0c00a8e33fd069a782b32eed5fef62c01b
diff --git a/files/apache-keystone.template b/files/apache-keystone.template
index 1284360..480fe06 100644
--- a/files/apache-keystone.template
+++ b/files/apache-keystone.template
@@ -38,6 +38,7 @@
 %SSLLISTEN%    %SSLENGINE%
 %SSLLISTEN%    %SSLCERTFILE%
 %SSLLISTEN%    %SSLKEYFILE%
+%SSLLISTEN%    SSLProtocol -all +TLSv1.3 +TLSv1.2
 %SSLLISTEN%</VirtualHost>
 
 Alias /identity %KEYSTONE_BIN%/keystone-wsgi-public