Update URLs for downloading older MySQL versions on Travis

For some unknown reasons URLs were changes and old one does not work
anymore.

Author: pali

.travis.yml

@@ -438,8 +438,8 @@ before_install:
   - if [ "$DB" = "MySQL" ]; then
       case "$VERSION" in
         4.1.*)            SANDBOX_URL=http://mysql.localhost.net.ar/Downloads/MySQL-4.1/mysql-standard-$VERSION-unknown-linux-gnu-x86_64-glibc23.tar.gz ;;
-        5.0.[012]*)       SANDBOX_URL=https://downloads.mysql.com/archives/get/file/mysql-standard-$VERSION-linux-x86_64-glibc23.tar.gz ;;
-        5.[01].*)         SANDBOX_URL=https://downloads.mysql.com/archives/get/file/mysql-$VERSION-linux-x86_64-glibc23.tar.gz ;;
+        5.0.[012]*)       SANDBOX_URL=https://downloads.mysql.com/archives/get/p/23/file/mysql-standard-$VERSION-linux-x86_64-glibc23.tar.gz ;;
+        5.[01].*)         SANDBOX_URL=https://downloads.mysql.com/archives/get/p/23/file/mysql-$VERSION-linux-x86_64-glibc23.tar.gz ;;
         5.5.?)            SANDBOX_URL=https://dev.mysql.com/get/mysql-$VERSION-linux2.6-x86_64.tar.gz ;;
         5.5.[1234]*)      SANDBOX_URL=https://dev.mysql.com/get/mysql-$VERSION-linux2.6-x86_64.tar.gz ;;
         5.5.5[012345]*)   SANDBOX_URL=https://dev.mysql.com/get/mysql-$VERSION-linux2.6-x86_64.tar.gz ;;