* Add AllowEncodedSlashes to apache

Add `AllowEncodedSlashes On` to apache config to support encoding for v3 rooms. "The AllowEncodedSlashes setting is not inherited by virtual hosts, and virtual hosts are used in many default Apache configurations, such as the one in Ubuntu. The workaround is to add the AllowEncodedSlashes setting inside a <VirtualHost> container (/etc/apache2/sites-available/default in Ubuntu)." Source: https://stackoverflow.com/questions/4390436/need-to-allow-encoded-slashes-on-apache

* change allowencodedslashes to nodecode

We don't ship jessie packages, so these were a bit misleading.

... mostly to fix pep8 fails

Fixes #3951.

This commit adds two config options:

* `restrict_public_rooms_to_local_users`

Requires auth to fetch the public rooms directory through the CS API and disables fetching it through the federation API.

* `require_auth_for_profile_requests`

When set to `true`, requires that requests to `/profile` over the CS API are authenticated, and only returns the user's profile if the requester shares a room with the profile's owner, as per MSC1301.

MSC1301 also specifies a behaviour for federation (only returning the profile if the server asking for it shares a room with the profile's owner), but that's currently really non-trivial to do in a not too expensive way. Next step is writing down a MSC that allows a HS to specify which user sent the profile query. In this implementation, Synapse won't send a profile query over federation if it doesn't believe it already shares a room with the profile's owner, though.

Groups have been intentionally omitted from this commit.

Limit in flight DNS requests

Follow-up to #5124

Also added a bunch of checks to make sure everything (both the stuff added on #5124 and this PR) works as intended.

Ratelimit 3pid invites

This endpoint isn't much use for its intended purpose if you first need to get
yourself an admin's auth token.

I've restricted it to the `/_synapse/admin` path to make it a bit easier to
lock down for those concerned about exposing this information. I don't imagine
anyone is using it in anger currently.

... after it got broken in 1565ebec.

Synapse 0.99.3.2 (2019-05-03)
=============================

Internal Changes
----------------

- Ensure that we have `urllib3` <1.25, to resolve incompatibility with `requests`. ([\#5135](https://github.com/matrix-org/synapse/issues/5135))

Build fixes

psycopg 2.8 is now out, which means that the C library gets built from source,
so we now need libpq-dev when building.

Turns out the need for this package is already documented in
docs/postgres.rst.

Blacklist 0.0.0.0 and :: by default for URL previews

Use SystemRandom for token generation.

Add some limitations to alias creation

Rather than copying-and-pasting the same four lines hundreds of times

Move the admin API to `/_synapse/admin/v1`

It doesn't really belong under rest/client/v1 any more.