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Introduce APACHE_SYSLOG_TAG

See merge request !2

This will cause the local rsyslog daemon to *not* forward them to
the centralized collector, to avoid duplicating HTTP access logs
that are already generated by nginx.

PHP support will be moved to its own image. This also removes the
requirement for a complex build-time setup script: child images can
now simply run their own a2enmod/a2enconf/a2ensite commands to enable
or disable modules, snippets, and sites.

Fixes issues #3 and #4.

Switch error log to syslog

See merge request !1

Current logs going through stderr -> chaperone -> journald have been
observed to stop after the container has been running for a while, try
switching to /dev/log instead.

This reverts commit f7eac1ff.

The version of php-fpm we're using does not support the syntax.

Use offsets for the apache-exporter and the php-fpm-exporter that do
not overlap when multiple instances run on the same machine...

Without $HOME, the exporter won't start correctly with the unhelpful
message "exit status 2" (actually a config/flag parser failure).

Using https://github.com/hipages/php-fpm_exporter.

apache2 envvars has some variables unset

/usr/local/bin/setup-apache.sh: 7: /etc/apache2/envvars: APACHE_CONFDIR: parameter not set

Use the environment variable PHP_FPM_ENABLE=1 instead.

Uses APACHE_PORT + 100 internally to avoid conflicts even in absence
of network isolation.

Php-fpm wants to write to /var/log/php7.0-fpm.log regardless
of its configuration (it won't start otherwise).

Relax permissions on runtime dirs, and allow APACHE_RUN_USER
to be set in the container environment.