Rewrite file_download_test
Rewrite file_download_test

Signed-off-by: Simon Leung <23f08a50fbaf82c4ecfae6738d41887b087c2e71@us.ibm.com>

cf-routing/cli,hyenaspots/cli,markstgodard/cli,hyenaspots/cli,mcintyred/cli,mcintyred/cli,hyenaspots/cli,cf-routing/cli,cf-routing/cli,cf-routing/cli,fujitsu-cf/cli,simonleung8/cli,markstgodard/cli,mcintyred/cli,simonleung8/cli,simonleung8/cli,mcintyred/cli,markstgodard/cli,fujitsu-cf/cli,hyenaspots/cli,fujitsu-cf/cli,markstgodard/cli