Quick and ugly fix for "division by zero"

Quick and ugly fix for "division by zero"

Workaround for "ZeroDivisionError: float division by zero" and
"RuntimeError: Unable to retrieve TSC" issues.
The actual clean fix requires reworking get_data() to accumulate
bytes received from PROX TCP port until EOL is received.
Since the other functions calling get_data() expect a synchronous
answer from PROX, timeout should be considered a fatal error, and
the current default at 10ms was just calling for problems!

Even if this change does not get merged, at least this workaround
will be available to end-users for cherry-picking from gerrit,
while the actual clean fix is being implemented.

JIRA: YARDSTICK-1381

Change-Id: I6af226ca31aaebeb50302e24b1eb209de70f6526
Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>