Remove the xmlrpc extension recommendation in environmental checks

0 - Prerequisites Ensure that there is NOT any $CFG->moodledata/environment directory in your installation. If it exists... it contains old environment info. Remove the directory completely before continuing with the tests below. Ensure that the php-xmlrpc extension is not enabled in you php/webserver. Depending of your OS you will need to disable / remove it in different ways. A - On Master, 400, 311 and 39 (all supported and security supported branches): Install a site from integration.git with that branch. Verify that the xmlrpc warning is shown (and warns, because the xmlrpc extension has been disabled by the prerequisites) when installing stables (39, 311, 400) but not master (4.1dev). Continue with the installation. Go to admin -> server -> environment One "4.1 upwards" Moodle version should be available. Verify that no "xmlrpc" check/recommendation is shown. If there are other (older than 4.1) versions available in the dropdown... select them. Verify that the "xmlrpc" check/recommendation is shown with message 'The XMLRPC extension is useful for web services and Moodle networking.' ^^^ Basically, verify that environment checks for versions < 4.1 continue showing the xmlrpc warning in all the branches, and that versions = 4.1 and up does not have the warning anymore. B - Verify, for all the numeric (XYZ) branches above, that the environment.xml file is 100% the same (requires git or diff use). All the commands should return NO differences (nothing should be output): Note: It's enough to test on one instance only (e.g. on a master instance) git diff MOODLE_XYZ_STABLE master admin/environment.xml