ENH+BF+TST: Filter now returns reference to failregex and ignoreregex

This avoids duplication of code across fail2ban-regex and samples test
cases. This also now more neatly resolves the issue of double counting
date templates matches in fail2ban-regex.
In addition, the samples test cases now also print a warning message
that not all regexs have samples for them, with future plan to change
this to an assertion.

server/datetemplate.py

@@ -59,11 +59,12 @@ class DateTemplate:
 	
 	def getHits(self):
 		return self.__hits
+
+	def incHits(self):
+		self.__hits += 1
 	
 	def matchDate(self, line):
 		dateMatch = self.__cRegex.search(line)
-		if not dateMatch is None:
-			self.__hits += 1
 		return dateMatch
 	
 	def getDate(self, line):