Init scripts: Honor RABBITMQ_LOG_BASE for {startup,shutdown}_* location

Before this change, they were written to /var/log/rabbitmq, no matter
the value of RABBITMQ_LOG_BASE.

In rabbitmq-env, allow the caller to set RABBITMQ_SCRIPTS_DIR to the
directory where rabbitmq-env and rabbitmq-default are located.

In both Fedora and Debian rabbitmq-server.init and
rabbitmq-script-wrapper, load rabbitmq-env and use RABBITMQ_LOG_BASE.
The default value is /var/log/rabbitmq, so the default behaviour remains
the same.

In Debian's rabbitmq-script-wrapper version, use RABBITMQ_LOG_BASE
instead of the hard-coded /var/log/rabbitmq.

Fixes #88.

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