python tests fix:

* SAL fix build xml update input (flow, meter, grup)
* fix the URL address for a flow in operational DS
* set default coloring disabled
* add logging wait time info

Change-Id: Ibd839ab64313ba9186e47d4f3b91b026c6d57cf8
Signed-off-by: Vaclav Demcak <vdemcak@cisco.com>