MaxScale should put its files in normal locations on the filesystem

MaxScale installs in its own directory in /usr/local/. This is not normal behavior for packages. Instead, files should be put into the appropriate existing locations on the filesystem. For example, files should go to /etc/ instead of /usr/local/mariadb-maxscale/etc and /usr/bin instead of /usr/local/mariadb-maxscale/bin/.

It's annoying to have to set up custom PATH components to easily find the maxadmin executable, and it's strange not to be able to create a MaxScale.cnf file in /etc/. Logs should go to /var/log/maxscale so that they can be found easily.