Allow database to be initialized without opening, unify all the
open paths to retry on failure.
In API router make sure open requests are matched with acks in explicit
way.
This also enables re-open attempts in all the aptly commands, so it
should make running aptly CLI much easier now hopefully.
Fix up system tests for oldoldstable ;)
After the first API request, the database was locked as long as the API
server is running. This prevents a user to also use the command-line
client. This commit adds a new flag `-no-lock` that will close the
database after each API request.
Closes#234
Unlocking the different elements in cache flusher was deferred to the
end of the function. Unfortunately, being a for loop wrapped in a
goroutine, deferred were never executed.
