Asterisk security log: accept EventTV in ISO8601

Asterisk uses ISO8601 dates in security log since version 12.

Closes #988

config/filter.d/asterisk.conf

@@ -13,6 +13,8 @@ _daemon = asterisk
 
 __pid_re = (?:\[\d+\])
 
+iso8601 = \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+[+-]\d{4}
+
 # All Asterisk log messages begin like this:
 log_prefix= (?:NOTICE|SECURITY)%(__pid_re)s:?(?:\[C-[\da-f]*\])? \S+:\d*( in \w+:)?
 
@@ -23,7 +25,7 @@ failregex = ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Registration from '[^']*'
             ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Host <HOST> failed MD5 authentication for '[^']*' \([^)]+\)$
             ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s Failed to authenticate (user|device) [^@]+@<HOST>\S*$
             ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s hacking attempt detected '<HOST>'$
-            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s SecurityEvent="(FailedACL|InvalidAccountID|ChallengeResponseFailed|InvalidPassword)",EventTV="[\d-]+",Severity="[\w]+",Service="[\w]+",EventVersion="\d+",AccountID="\d*",SessionID="0x[\da-f]+",LocalAddress="IPV[46]/(UD|TC)P/[\da-fA-F:.]+/\d+",RemoteAddress="IPV[46]/(UD|TC)P/<HOST>/\d+"(,Challenge="\w+",ReceivedChallenge="\w+")?(,ReceivedHash="[\da-f]+")?(,ACLName="\w+")?$
+            ^(%(__prefix_line)s|\[\]\s*)%(log_prefix)s SecurityEvent="(FailedACL|InvalidAccountID|ChallengeResponseFailed|InvalidPassword)",EventTV="([\d-]+|%(iso8601)s)",Severity="[\w]+",Service="[\w]+",EventVersion="\d+",AccountID="\d*",SessionID="0x[\da-f]+",LocalAddress="IPV[46]/(UD|TC)P/[\da-fA-F:.]+/\d+",RemoteAddress="IPV[46]/(UD|TC)P/<HOST>/\d+"(,Challenge="\w+",ReceivedChallenge="\w+")?(,ReceivedHash="[\da-f]+")?(,ACLName="\w+")?$
             ^(%(__prefix_line)s|\[\]\s*WARNING%(__pid_re)s:?(?:\[C-[\da-f]*\])? )Ext\. s: "Rejecting unknown SIP connection from <HOST>"$
 
 ignoreregex =