Revert "Raise on fatal errors instead of exit"

This reverts commit 4911532.

src/lavinmq.cr

@@ -17,12 +17,8 @@ config.parse # both ARGV and config file
 require "./lavinmq/launcher"
 require "./lavinmq/clustering/controller"
 
-begin
-  if config.clustering?
-    LavinMQ::Clustering::Controller.new(config).run
-  else
-    LavinMQ::Launcher.new(config).run
-  end
-rescue LavinMQ::Etcd::NoEtcdEndpoint
-  exit 5 # 5th character in the alphabet is E(etcd)
+if config.clustering?
+  LavinMQ::Clustering::Controller.new(config).run
+else
+  LavinMQ::Launcher.new(config).run
 end

src/lavinmq/etcd.cr

@@ -280,8 +280,6 @@ module LavinMQ
       end
     end
 
-    class NoEtcdEndpoint < Exception; end
-
     private def connect : Tuple(TCPSocket, String)
       @endpoints.shuffle!.each do |address|
         host, port = address.split(':', 2)
@@ -300,7 +298,7 @@ module LavinMQ
         next
       end
       Log.fatal { "No etcd endpoint responded" }
-      raise NoEtcdEndpoint.new
+      exit 5 # 5th character in the alphabet is E(etcd)
     end
 
     private def update_endpoints(tcp, address)