[Kareboot] Updated kareboot according to the new environment API compliant with RFC3986

bin/kareboot3

@@ -132,13 +132,16 @@ class KarebootClient < ClientWorkflow
     params[:check_destructive] = options[:check_demolishing] if options[:check_demolishing]
 
     if options[:env_name]
-      username = URI.encode_www_form_component(options[:env_user]) || ''
+      username = URI.encode_www_form_component(options[:env_user])
       envname = URI.encode_www_form_component(options[:env_name])
-      envversion = options[:env_version] || ''
+      envversion = options[:env_version]
 
       tmp = {}
       tmp[:last] = true unless options[:env_version]
-      envs = get2(options,api_path("/#{username}/#{envname}/#{envversion}",:envs),tmp)
+      tmp[:username] = username if username && !username.empty?
+      tmp[:name] = envname if envname && !envname.empty?
+      tmp[:version] = envversion if envversion
+      envs = get2(options,api_path("/",:envs),tmp)
       error("The environment '#{options[:env_name]}' does not exist") if envs.size <= 0
       env = envs.first