the get_num_phy_errors() uses the external KPI analyzer module
to calculate the number of PHY layers errors in a vector of log metrics
Change-Id: I0c8de87e7f83f986e288585640ce56847959c497
this method uses the kpi_analyzer module for analyzing
stdout, CSV metrics and the logfile (if present).
if the module can't be loaded, no KPI will be added.
Change-Id: I28226a375f9ac4e08424c488062ae6a74a19af92
Andre Puschmann