Merge pull request #12468 from isimluk/fetch_and_fetch_path

Don't use fetch, when you wish to fetch_path
(cherry picked from commit e669263)

https://bugzilla.redhat.com/show_bug.cgi?id=1378154

app/models/vim_performance_analysis.rb

@@ -273,7 +273,7 @@ def get_vm_needs
       options = @options
 
       if VimPerformanceAnalysis.needs_perf_data?(options[:vm_options])
-        perf_cols = [:cpu, :vcpus, :memory, :storage].collect { |t| options.fetch(:vm_options, t, :metric) }.compact
+        perf_cols = [:cpu, :vcpus, :memory, :storage].collect { |t| options.fetch_path(:vm_options, t, :metric) }.compact
       end
 
       vm_perf = VimPerformanceAnalysis.get_daily_perf(@vm, options[:range], options[:ext_options], perf_cols)