test_afi_generation.sh hides build output

[CampGareth]

reco-sdaccel/ci/test_afi_generation.sh

Line 21 in d8282e4

NUMBER=$(reco-aws build 2>$ERRFILE)

test_afi_generation.sh is the script underpinning the 'test hw builds' stage of testing on jenkins. It runs reco-aws build and blocks until it finishes. It also redirects stderr output from the running reco-aws to a temporary file. 99% of reco-aws's output is on stderr. After reco-aws returns test_afi_generation cats the temporary file containing reco-aws's log output.

If reco-aws hangs forever for some reason (say AFI generation goes wrong) then we never see any output.

[CampGareth]

I think this commit and its fixup help the situation but aren't the best solution:
9b29e78
a39d6fb