make sure the bundler task is just used once while bootstraping tests

Fixes #2237

rakelib/bootstrap.rake

@@ -1,3 +1,5 @@
 
 
 task "bootstrap" => [ "vendor:all", "compile:all" ]
+
+task "bootstrap:test" => [ "vendor:test", "compile:all" ]

rakelib/test.rake

@@ -1,6 +1,6 @@
 
 namespace "test" do
-  task "default" => [ "bootstrap", "test:prep" ] do
+  task "default" => [ "bootstrap:test", "test:prep" ] do
     Gem.clear_paths
     require "logstash/environment"
     LogStash::Environment.set_gem_paths!
@@ -17,6 +17,7 @@ namespace "test" do
   end
 
   task "prep" do
+    Rake::Task["vendor:gems"].invoke(false)
     Rake::Task["plugin:install-test"].invoke
   end
 

rakelib/vendor.rake

@@ -90,6 +90,7 @@ namespace "vendor" do
     end # untar
   end # jruby
   task "all" => "jruby"
+  task "test" => "jruby"
 
   task "geoip" do |task, args|
     vendor_name = "geoip"
@@ -137,6 +138,7 @@ namespace "vendor" do
     end # untar
   end # task kibana
   task "all" => "kibana"
+  task "test" => "kibana"
 
   task "kafka" do |task, args|
     name = task.name.split(":")[1]
@@ -205,12 +207,11 @@ namespace "vendor" do
     task "gems" => ["vendor:gems"]
   end
 
-  task "gems" do
+  task "gems", [:bundle] do |task, args|
     require "logstash/environment"
-
     Rake::Task["dependency:rbx-stdlib"] if LogStash::Environment.ruby_engine == "rbx"
     Rake::Task["dependency:stud"].invoke
-    Rake::Task["vendor:bundle"].invoke("tools/Gemfile")
+    Rake::Task["vendor:bundle"].invoke("tools/Gemfile") if args.to_hash.empty? || args[:bundle]
 
   end # task gems
   task "all" => "gems"