get-sysinfo: Replace deprecated os.popen3 with subprocess.Popen

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
client-latrate: ait-run doesn't pass the $CONFIG anymore

So just use the first parameter as the server to connect to.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
ait-run: Rename RATE_RANGE to METRIC_RANGE

As we now support other metrics than just "packet rate", with the
newest to be supported being "packet size", for the netperf UDP_STREAM
test being developed.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
ait-run: TESTNAME must be set on the config file or on the environment

Check that the config file is passed and that TESTNAME is set in it or
in the shell environment.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
ait-netperf-udp_stream: New test

Add the client, db glue and the new tables in the database for
a netperf UDP_STREAM test.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>