* Bump gomatrixserverlib
Mostly because I want to use Erik's go-faster jsoning.
* Update KeyDB for new KeyFetcher API
we now need to implement FetcherName.
* Attempt to fix integ tests
CanonicalJSON doesn't like the empty string, apparently, and anyway
canonicalising it is pointless.
* More integ test fix
* bump gomatrixserverlib
(changes to KeyFetcher and KeyDatabase interfaces)
* Store keys rather than json in the keydatabase
Rather than storing the raw JSON returned from a /keys/v1/query call in the
table, store the key itself.
This makes keydb.Database implement the updated KeyDatabase interface.
