fix the issue caused by jruby-kafka that prevent to run the packaging

Fixes #3393

lib/pluginmanager/main.rb

@@ -34,7 +34,6 @@ end
 
 if $0 == __FILE__
   begin
-    LogStash::Bundler.setup!({:without => [:build, :development]})
     LogStash::PluginManager::Main.run("bin/plugin", ARGV)
   rescue LogStash::PluginManager::Error => e
     $stderr.puts(e.message)

lib/pluginmanager/uninstall.rb

@@ -4,6 +4,13 @@ class LogStash::PluginManager::Uninstall < LogStash::PluginManager::Command
   def execute
     signal_error("File #{LogStash::Environment::GEMFILE_PATH} does not exist or is not writable, aborting") unless File.writable?(LogStash::Environment::GEMFILE_PATH)
 
+    ##
+    # Need to setup the bundler status to enable uninstall of plugins
+    # installed as local_gems, otherwise gem:specification is not
+    # finding the plugins
+    ##
+    LogStash::Bundler.setup!({:without => [:build, :development]})
+
     # make sure this is an installed plugin and present in Gemfile.
     # it is not possible to uninstall a dependency not listed in the Gemfile, for example a dependent codec
     signal_error("This plugin has not been previously installed, aborting") unless LogStash::PluginManager.installed_plugin?(plugin, gemfile)