lisa.trace: Add Trace.__init__(strict_events=False) parameter
lisa.trace: Add Trace.__init__(strict_events=False) parameter

Allow parsing all and only the events specified in ``events``. This provides
early failure, as well as avoiding lazy loading. This includes lazy loading used
to detect available events, which can result in a significant slow down for
large traces.

credp/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,credp/lisa