Fix linting errors in go1.9.1

* Update gometalinter config

gometalinter now uses `maligned` instead of `aligncheck`
(https://github.com/alecthomas/gometalinter/pull/367), so we need to update our
config accordingly.

* Update gometalinter

* Disable gotype linter

gotype does not seem to play nicely with the gb vendor directory. In
particular, it wants each of our dependencies to be built and installed (see
https://github.com/golang/go/issues/10969), but (empirically) it will not
accept them being installed in `pkg` but insists on them being in `vendor/pkg`.

This presents a problem because `gb build` builds the packages into `pkg`
(which doesn't seem entirely unreasonable since `.` comes before `vendor` in
`$GOPATH`). `go install github.com/x/y` does install in `vendor/pkg` but
requires us to know the name of each package.

The general conclusion of https://github.com/alecthomas/gometalinter/issues/91
seems to have been that the easiest thing to do is to disable `gotype` for now.

* Fix `unparam` lint

* Fix goshadow lint

Signed-off-by: NAndrew (anoa) <anoa@openmailbox.org>

Signed-off-by: NMichael Telatynski <7t3chguy@gmail.com>

* Federation: Implement Query Profile API

Implements the server portion of: `GET
/_matrix/federation/v1/query/profile?user_id=...&field=...`

Closes #278
Signed-off-by: NAndrew (anoa) <anoa@openmailbox.org>

* Properly export profile-related structs and fix wording
Signed-off-by: NAndrew (anoa) <anoa@openmailbox.org>

* Check provided user's domain matches our own.

This is in preperation for implementing various federation APIs that
need to build events.

Signed-off-by: NPaul Tötterman <paul.totterman@iki.fi>

Signed-off-by: NRemi Reuvekamp <git@remireuvekamp.nl>

The HTTP handlers in the components are split into reader and writer directories. This was a fairly arbitrary distinction, and turns out to not be so helpful. Most read APIs have a corresponding write API, and it is more natural for them to be in the same file rather than in different directories.

The prior naming was confusing, OutputRoomEvent consumed
OutputNewRoomEvents

* Implement filter POSTing and GETting.
Signed-off-by: NJan Christian Grünhage <jan.christian@gruenhage.xyz>

* Add missing '}' typo introduced during merge

* Still trying to fix that merge...

* Fix linting

Signed-off-by: NMTRNord <mtrnord1@gmail.com>

* Add opentracing Spans to the HTTP APIs

* Add opentracing spans to the HTTP RPC clients

* Set the span in the request context

* More docstring

* Implement setting alias during room create

* Implement shared secret registration

* Use HexString from gomatrixserverlib

* Correctly check username validility

* Add 'unused' lint

* Keep testdata consts

* Add errcheck linter

* Add config for 'fast' linters

* Fix errcheck lint stuff

* Fix errcheck lint

* Add contexts to device database

* Remove spurious whitespace

* Specify HTTP methods for the client API

* Specify HTTP methods for the federation API

* Specify HTTP methods for the media API

* Specify HTTP methods for the sync API

* Add context.Context to the federation client

* gb vendor update github.com/matrix-org/gomatrixserverlib

* Add comment

* gb vendor update github.com/matrix-org/gomatrixserverlib

* Add handler for the exchange_third_party_invite endpoint

* Doc

* Use SendEvents to send the invite to the roomserver

* Add missing error check

* Add checks

Because it's easy to get confused between the two methods.

* Add config for trusted ID servers

* Add new error

* Implement check for trusted ID server

* Complete unfinished comment

* Make comment more explicit in the config file

* Use go standard errors in membership.go

* Use standard errors instead of JSON responses in threepid

* Doc errors

* Remove unused parameter

* Turn on 'unparam' linting

* Increase deadline

* Fix mediaapi integeration test

* Remove unused struct field

* Ignore unused test data

* Remove unused variables

* Remove deadcode

* Fix up vetshadow warnings

* Convert to using gometalinter

* Update travis

* Use vendored versions of gometalinter

* Make gometalinter install its stuff

* Vendor misspell