[MiqWorker::worker_settings] Handle number strings

Due to some UI specific issues, settings in the config can be set as
"integer strings", or a string that is just a integer (floats are also
possible).  This doesn't work booting workers as it initializes them
with incorrect values.

This does some extra checking to avoid that.

app/models/miq_worker.rb

@@ -209,7 +209,13 @@ def self.fetch_worker_settings_from_server(miq_server, options = {})
         # Clean up the configuration values in a format like "30.seconds"
         unless raw
           settings.keys.each do |k|
-            settings[k] = settings[k].to_i_with_method if settings[k].respond_to?(:to_i_with_method) && settings[k].number_with_method?
+            if settings[k].kind_of?(String)
+              if settings[k].number_with_method?
+                settings[k] = settings[k].to_i_with_method
+              elsif settings[k] =~ /\A\d+(.\d+)?\z/ # case where int/float saved as string
+                settings[k] = settings[k].to_i
+              end
+            end
           end
         end
       end

spec/models/miq_worker_spec.rb

@@ -207,6 +207,41 @@ def check_has_required_role(worker_role_names, expected_result)
       end
     end
 
+    context "with mixed memory value types" do
+      # Same settings from above, just using integers and integers/floats as strings
+      let(:settings) do
+        {
+          :workers => {
+            :worker_base => {
+              :defaults          => {:memory_threshold => "100.megabytes"},
+              :queue_worker_base => {
+                :defaults           => {:memory_threshold => 314_572_800}, # 300.megabytes
+                :ems_refresh_worker => {
+                  :defaults                  => {:memory_threshold => "524288000"}, # 500.megabytes
+                  :ems_refresh_worker_amazon => {
+                    :memory_threshold => "1181116006.4" # 1.1.gigabtye
+                  }
+                }
+              }
+            }
+          },
+          :ems     => {:ems_amazon => {}}
+        }
+      end
+
+      let(:worker_base)  { MiqWorker.worker_settings[:memory_threshold] }
+      let(:queue_worker) { MiqQueueWorkerBase.worker_settings[:memory_threshold] }
+      let(:ems_worker)   { ManageIQ::Providers::BaseManager::RefreshWorker.worker_settings[:memory_threshold] }
+      let(:aws_worker)   { ManageIQ::Providers::Amazon::CloudManager::RefreshWorker.worker_settings[:memory_threshold] }
+
+      it "converts everyting to integers properly" do
+        expect(worker_base).to  eq(100.megabytes)
+        expect(queue_worker).to eq(300.megabytes)
+        expect(ems_worker).to   eq(500.megabytes)
+        expect(aws_worker).to   eq(1_181_116_006)
+      end
+    end
+
     it "at the base class" do
       actual = MiqWorker.worker_settings[:memory_threshold]
       expect(actual).to eq(100.megabytes)