Add tests catchall order (#355)

* Only check whole rule names when matching counts

Tweak the regex so a rule my_great_rule doesn't pick up event counts for
a rule "great_rule: nnn".

* Add ability to skip evttype warnings for rules

A new attribute warn_evttypes, if present, suppresses printing warnings
related to a rule not matching any event type. Useful if you have a rule
where not including an event type is intentional.

* Add test for preserving rule order

Test the fix for https://github.com/draios/falco/issues/354. A rules
file has a event-specific rule first and a catchall rule second. Without
the changes in https://github.com/draios/sysdig/pull/1103, the first
rule does not match the event.

test/rules/catchall_order.yaml

@@ -0,0 +1,12 @@
+- rule: open_dev_null
+  desc: Any open of the file /dev/null
+  condition: evt.type=open and fd.name=/dev/null
+  output: An open of /dev/null was seen (command=%proc.cmdline evt=%evt.type %evt.args)
+  priority: INFO
+
+- rule: dev_null
+  desc: Anything related to /dev/null
+  condition: fd.name=/dev/null
+  output: Something related to /dev/null was seen (command=%proc.cmdline evt=%evt.type %evt.args)
+  priority: INFO
+  warn_evttypes: false