Don't require sd_notify if not running in systemd

Author: agrare

workers/event_catcher/event_catcher.rb

@@ -135,14 +135,14 @@ def messaging_client
   end
 
   def notify_started
-    SdNotify.ready
+    SdNotify.ready if ENV.fetch("NOTIFY_SOCKET", nil)
   end
 
   def heartbeat
-    SdNotify.watchdog
+    SdNotify.watchdog if ENV.fetch("NOTIFY_SOCKET", nil)
   end
 
   def notify_stopping
-    SdNotify.stopping
+    SdNotify.stopping if ENV.fetch("NOTIFY_SOCKET", nil)
   end
 end

workers/event_catcher/worker

@@ -2,13 +2,13 @@
 
 require "bundler/inline"
 
-gemfile do
+gemfile(false) do
   source "https://rubygems.org"
 
   gem "manageiq-loggers", "~>1.0"
   gem "manageiq-messaging", "~> 1.0"
   gem "rbvmomi2", "~> 3.3"
-  gem "sd_notify"
+  gem "sd_notify" if ENV.fetch("NOTIFY_SOCKET", nil)
   gem "json"
 end