hsa: add http throughput test server app

hsa: add http throughput test server app

Can be used for throughput testing over http. For instance, start
server:

http tps #implicitly listens on port 80

Then, to test throughput with curl:

curl <server_ip>/test_file_10g
curl <server_ip>/test_file_123m

Similarly, for https:

http tps uri tls://<server_ip>/443
curl -k <server_ip>/test_file_1g

Type: feature

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I30ab7f0d94a7357b3f04546e4a3d3c410a733908