Don't use https for patch, since this'll break on some servers.
Issue #2084963 by m.stenta: Fixed SSL vhost does not respect Alias redirects
expect ip_addresses as an array instead of a single entry, as we support multiple servers

should fix #2071317, but untested
Issue #2096629 by cinnamon: Fixed hook_provision_drupal_create_directories_alter() by ref.
subdirs: properly create a example.com.foo symlink
add an extra rewrite rule for subdirectory support so clean_urls work (#2097689)
subdirs: forgot to enable mod_rewrite, oddly enough
Issue #2098389: Record enabled Hosting Features in /var/aegir/.drush/drushrc.php.

We want to be able to block unwanted Drush hooks from firing, especially those in
extensions where the front-end module is not enabled. To do so, we need to know
which Hosting Features are enabled very early in the Drush bootstrap process, since
blocking the unwanted hooks from firing is accomplished with hook_drush_load()'s.
Only run subdir hooks when the front-end module is enabled.
Issue #2096629 by helmo, cweagons: Add hook documentation.
Issue #2096629 by helmo: Cleanup invalid comments and an unused $profile parameter.
Simplify enabled features array.
Only run dns hooks when the front-end module is enabled.
Merge branch 'dev/2098389' into 6.x-2.x
move subdir implementation to the Apache service

the reasoning is that we need to operate on multiple servers, which
can't be done outside of services.

furthermore, we had to move to a Config class for sync to work, and we
hack up that class badly so that it is forced to generate multiple
configuration files instead of just one, which is impure and weird,
but seems to work in my first tests.

we still need to reimplement sites.php and disabled sites support, but
multi-server should work better now

see #2020075 and #2020079
fix disabled site support
restore crappy vhost and sites.php support
no need to regenerate on enable now that disable/enable is handled by the service
move subdir vhost generation to the service
fix path to vhost file