swap try_client_by_id with client_by_id

i.e. allow client_by_id to fail and return NULL.

Initially I thought it was a good idea to shut down a server process
if we receive an invalid client id as reply from one of our requests
to the executor process.  This turned out not to be correct since a
client can (read: will) disconnect in the delay beteewn we acknowledge
their request and the cgi script execution.

The fastcgi and proxy handler already handled this situation, so
they're unaffected.

This allows an attacker to make gmid unresponsible by just making
enough requests until they hit the right timing.

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