Make cache ttl for bird responses a config option

For bird and bird6 you may add ttl to the respective config file sections.
See example config in this commit.
This allows to have individual ttls for the cache of bird cli output per daemon.

bird/bird.go

@@ -49,7 +49,11 @@ func fromCache(key string) (Parsed, bool) {
 }
 
 func toCache(key string, val Parsed) {
-	val["ttl"] = time.Now().Add(10 * time.Minute)
+	var ttl int = 5
+	if ClientConf.CacheTtl > 0 {
+		ttl = ClientConf.CacheTtl
+	}
+	val["ttl"] = time.Now().Add(time.Duration(ttl) * time.Minute)
 	Cache.Lock()
 	Cache.m[key] = val
 	Cache.Unlock()

bird/config.go

@@ -13,6 +13,7 @@ type BirdConfig struct {
 	Listen         string
 	ConfigFilename string `toml:"config"`
 	BirdCmd        string `toml:"birdc"`
+	CacheTtl       int    `toml:"ttl"`
 }
 
 type ParserConfig struct {

birdwatcher.go

@@ -89,6 +89,7 @@ func PrintServiceInfo(conf *Config, birdConf bird.BirdConfig) {
 	log.Println("Starting Birdwatcher")
 	log.Println("            Using:", birdConf.BirdCmd)
 	log.Println("           Listen:", birdConf.Listen)
+	log.Println("        Cache TTL:", birdConf.CacheTtl)
 
 	// Endpoint Info
 	if len(conf.Server.AllowFrom) == 0 {

etc/ecix/birdwatcher.conf

@@ -45,12 +45,13 @@ requests_per_minute = 10
 listen = "0.0.0.0:29188"
 config = "/etc/bird.conf"
 birdc  = "/sbin/birdc"
-
+ttl = 5 # time to live (in minutes) for caching of cli output
 
 [bird6]
 listen = "0.0.0.0:29189"
 config = "/etc/bird6.conf"
 birdc  = "/sbin/birdc6"
+ttl = 5 # time to live (in minutes) for caching of cli output
 
 [parser]
 # Remove fields e.g. interface
@@ -60,4 +61,3 @@ filter_fields = []
 per_peer_tables = true
 peer_protocol_prefix = 'ID'
 pipe_protocol_prefix = 'P'
-