fixed errors in admin_spec.rb

This change aimed at fixing the following test case failures:

rspec ./spec/integration/admin_spec.rb:203 # AdminUI::Admin retrieves and validates logs retrieves
rspec ./spec/integration/admin_spec.rb:303 # AdminUI::Admin tasks creates DEA, retrieves all tasks and retrieves specific status

  1) AdminUI::Admin retrieves and validates logs retrieves
     Failure/Error: expect(item).to include('path' => log_file_displayed,
       expected {"path"=>"/tmp/admin_ui_displayed.log", "size"=>32, "time"=>1395784913000} to include {"path"=>"/tmp/admin_ui_displayed.log", "size"=>32, "time"=>1395784913735}
       Diff:
       @@ -1,2 +1,4 @@
       -[{"path"=>"/tmp/admin_ui_displayed.log", "size"=>32, "time"=>1395784913735}]
       +"path" => "/tmp/admin_ui_displayed.log",
       +"size" => 32,
       +"time" => 1395784913000
     # ./spec/integration/admin_spec.rb:208:in `block (4 levels) in <top (required)>'

  2) AdminUI::Admin tasks creates DEA, retrieves all tasks and retrieves specific status
     Failure/Error: expect(found_out).to be_true
       expected: true value
            got: false
     # ./spec/integration/admin_spec.rb:341:in `block (3 levels) in <top (required)>'