tools: tests: FirstMatchSimpleFilter ignore ordering

ignore ordering of output events as it may be at any order as long as
correct events are sent.

simplify tests while doing so.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1171160
Change-Id: I935b68fa497cd793a503aff7f84be03e80603e94
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>