Prefer ServerReload methods that use ManagementClient instead of ModelControllerClient

The ServerReload.executeReloadAndWaitForCompletion variants that take a ManagementClient instead of a ModelControllerClient are more robust because the ManagementClient can specfically provide the host/port to try to reconnect to, while the ModelControllerClient variants have to guess using TestsuiteEnvironment.

This shouldn't matter in most cases but by changing the code to the more robust variant that will encourage it's use in new tests where it might matter.