LAVA-1253 - CSV export headers are incorrect
LAVA-1253 - CSV export headers are incorrect

Fix header formatting in test job csv export.

Change-Id: I5fa5bbb9064c5005414f7ab2273cb93262c979f2

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server