utils/wa_results_collector: let's be more friendly with filters definition
utils/wa_results_collector: let's be more friendly with filters definition

This allows to specify "pelt" instead of ".*pelt.*" to focus for example
on experiments which have been executed on a PELT enabled kernel.
We can still use RE, thus "list_view.*pelt" is still a valid filter.

Signed-off-by: Patrick Bellasi <431c86f368affbc3148c4669fbd465131f7e82cb@arm.com>

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