Fix Stream processor drainAndStop timeout

org.nuxeo.lib.stream.computation.StreamProcessor#drainAndStop is used to terminate processors after trying to process remaining records in the stream.
This is used in many unit tests and now in the repair Works operation NXP-27673.

This method takes a timeout parameter but incorrectly.
The drain will stop before the timeout and while there are still records to process if the processing of a record or timer takes more than 1 second.

This is a possible cause of random UT failures on loaded CI slaves.
Also, for the WorkManager repair procedure, it requires to executed many times the operation to process all Works in failure.