Propagate more error codes internally
Tweak Avast scanner interface
Apply timeout to Fsecure malware response.  Bug 1549
Testsuite: cases for malware= interfaces to f-protd, aveserver, fsecure, soophie & clamav

There are running against scripts not the rea thing
so only useful for spotting gross breakage.
Testsuite: case for malware= avast