symlinks apparently break setuptools on python3 and alpine
(https://bugs.python.org/issue31940), so let's stop using a symlink and just
use the file directly.

Fix ncorrect ports in documentation and add notes on how generate-config also generates certs bound to whatever hostname you give with --generate-config.

SYN-87 #resolved

Make instructions synctl gives for generateing a config file actuall generate a config file. Also, make synctil run synapse correctly by invoking a module such that the path is correct to pull in other bits from the working directory rather than requiring them to be on the PYTHONPATH (which would lead to people being very confused when they edit source in the working directory and their changes do not take effect).

Don't autogen config in synctl for the same reasons we don't turn of --generate-config by default on the homeserver - it is liable to confuse people who have moved the config file or have chosen a non standard location.

Also, don't override log file location.