The database lookup doesn't work during the asyn process, so this change
loops through the connectors and grabs the formatted urls before sending
it to the async handler.
Instead of having individual search functions that make individual
requests, the connectors will always be searched asynchronously
together. The process_seach_response combines the parse and format
functions, which could probably be merged into one over-rideable
function.
The current to-do on this is to remove Inventaire search results that
are below the confidence threshhold after search, which used to happen
in the `search` function.
This is the untest first pass at re-arranging remote search to work in
parallel rather than sequence. It moves a couple functions around
(raise_not_valid_url, for example, needs to be in connector_manager.py
now to avoid circular imports). It adds a function to Connector objects
that generates a search result (either to the isbn endpoint or the free
text endpoint) based on the query, which was previously done as part of
the search.
I also lowered the timeout to 8 seconds by default.
