Catch general exception to signal failure

Catching only InstrumentationException, MeasurementException and
WorkloadException would not forward different exceptions that may occur
during initialization of GlobalConfiguration, e.g. for wrong parameters
"" for filename.

Change-Id: I2cf43cbb7468e593ec517f581cbbea84de424ff1
Signed-off-by: Denis Knoepfle <denis.knoepfle@sap.com>