compute client: don't remove socket from cache whenever there is any error; when compute is slow, there will be a lot of errors and adding a bunch of new connections only makes matters much worse; also increase timeout slightly
compute client: don't remove socket from cache whenever there is any error; when compute is slow, there will be a lot of errors and adding a bunch of new connections only makes matters much worse; also increase timeout slightly

tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc