we are not getting all possible contexts because there's no easy way
to enumerate them, so instead we just don't check

Issue #1635622 by anarcat - Default nginx config doesn't talk to the default php-fpm config in Debian Wheezy and sid.

this is necessary for settings like ssl_enabled to propagate to sites
on the meta-server

see #1784108

it seems this was just incorrectly done: the _config entry wasn't used
as an array while $configs is an array of arrays.

since _config is private I feel safe in changing the way it is
structured and used internally, and externally the API doesn't really
change, it just works. :)

this is to fix the regression introduced in e918bcc8, see #2000038

fix regression introduced in 4bbd969b

This reverts commit 7d5f546e.

those are drush packets that spew out on stderr

This reverts commit 59a0a654.

it seems that those packets are sent to stderr, so we merge stderr
into stdout. we also pass the --debug flag to backend-parse so that it
actually shows the debug output when debugging is enabled

otherwise the other provision commands will not work properly

this was working only through the frontend because the server
verification was triggering verification for all platforms on the
server, which would only then create the missing configuration file.

now we generate the include file within the server context, where we
should.

This reverts commit 2537caf0.

we are keeping the old method of installing from git, which means we
will install post-alpha2 code when there are commits to the frontend,
but meh - we currently can't install alpha2 at all from git, so that's
better.

we at least need to download the hostmaster profile in aegir.make, but
then that means it will recurse into hostmaster.make, so it means we
need to fiddle with *that* code if we want have sticky branches there.

the other alternative is to build from the distribution, but that's
not supported by Drush make, only by pm-download.

This reverts commit 738fad24.