Author: Marco Ferrante
MDL-64071 auth: enhanced diagnostic of LDAP auth config
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e45c86375aa741c2968d53f20491e33b15698284
http://github.com/moodle/moodle/commit/e45c86375aa741c2968d53f20491e33b15698284
+ 3.7 en [diag_genericerror,auth_ldap]
+ 3.7 en [diag_toooldversion,auth_ldap]
+ 3.7 en [diag_emptycontext,auth_ldap]
+ 3.7 en [diag_contextnotfound,auth_ldap]
+ 3.7 en [diag_rolegroupnotfound,auth_ldap]