Remove --conservative flag while installing ruby deps

Change-Id: I5172510494ac95ae8eccb5891dc71cc60b9e3f0b
diff --git a/src/com/mirantis/mk/Ruby.groovy b/src/com/mirantis/mk/Ruby.groovy
index f9df3ad..05c4873 100644
--- a/src/com/mirantis/mk/Ruby.groovy
+++ b/src/com/mirantis/mk/Ruby.groovy
@@ -21,8 +21,8 @@
  * Install kitchen tools
  */
 def installKitchen(kitchenInit=""){
-    sh """rbenv exec gem install bundler -v '~> 1.15.4' --conservative;
-          rbenv exec gem install test-kitchen --conservative;"""
+    sh """rbenv exec gem install bundler -v '~> 1.15.4';
+          rbenv exec gem install test-kitchen;"""
     if(kitchenInit!=""){
         sh kitchenInit
     }else{