Explicitly disable systemd support in podified env

If we are on a podified environment we should explicitly disable systemd
support.

lib/miq_environment.rb

@@ -16,7 +16,7 @@ def self.supports_apache?
 
     def self.supports_systemd?
       return @supports_systemd unless @supports_systemd.nil?
-      @supports_systemd = is_appliance? && supports_command?('systemctl')
+      @supports_systemd = is_appliance? && !is_container? && supports_command?('systemctl')
     end
 
     def self.supports_nohup_and_backgrounding?

spec/lib/miq_environment_spec.rb

@@ -115,6 +115,19 @@ def appliance_conditions
             assert_same_result_every_time(:is_production_build?, true)
           end
         end
+
+        context ".supports_systemd?" do
+          it "returns false when containerized" do
+            container_conditions
+            assert_same_result_every_time(:supports_systemd?, false)
+          end
+
+          it "returns true when appliance conditions are met" do
+            appliance_conditions
+            expect(MiqEnvironment::Command).to receive(:supports_command?).with("systemctl").and_return(true)
+            assert_same_result_every_time(:supports_systemd?, true)
+          end
+        end
       end
     end
   end