Be explicit about return codes

Author: Michael Klishin

ruby/receive.rb

@@ -16,4 +16,6 @@
   end
 rescue Interrupt => _
   conn.close
+
+  exit(0)
 end

ruby/receive_logs.rb

@@ -21,4 +21,6 @@
 rescue Interrupt => _
   ch.close
   conn.close
+
+  exit(0)
 end

ruby/receive_logs_direct.rb

@@ -27,4 +27,6 @@
 rescue Interrupt => _
   ch.close
   conn.close
+
+  exit(0)
 end

ruby/receive_logs_topic.rb

@@ -27,4 +27,6 @@
 rescue Interrupt => _
   ch.close
   conn.close
+
+  exit(0)
 end