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.

userspace/engine/lua/rule_loader.lua

@@ -373,8 +373,14 @@ function load_rules(rules_content, rules_mgr, verbose, all_events, extra, replac
 
       local v = state.rules_by_name[name]
 
+      warn_evttypes = true
+      if v['warn_evttypes'] ~= nil then
+	 warn_evttypes = v['warn_evttypes']
+      end
+
       local filter_ast, evttypes, syscallnums = compiler.compile_filter(v['rule'], v['condition'],
-								     state.macros, state.lists)
+									state.macros, state.lists,
+									warn_evttypes)
 
       if (filter_ast.type == "Rule") then
 	 state.n_rules = state.n_rules + 1