Fix two destruction order issues causing segfaults during shutdown #789
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1. `application_impl::~application_impl` calls the `plugin_manager` when `VSOMEIP_ENABLE_MULTIPLE_ROUTING_MANAGERS` is not defined. Therefore it should hold a `shared_ptr` to it instead of calling `plugin_manager::get()` in the destructor, in order to prevent the global `the_plugin_manager__` instance being destroyed before it is. 2. `routing_manager_impl::~routing_manager_impl` calls `utility` functions. Therefore destroy the `routing_` instance in `application_impl::shutdown` to ensure that this happens before the `utility` global variables are destroyed.
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application_impl::~application_implcalls theplugin_managerwhenVSOMEIP_ENABLE_MULTIPLE_ROUTING_MANAGERSis not defined. Therefore it should hold ashared_ptrto it instead of callingplugin_manager::get()in the destructor, in order to prevent the globalthe_plugin_manager__instance being destroyed before it is.routing_manager_impl::~routing_manager_implcallsutilityfunctions. Therefore destroy therouting_instance inapplication_impl::shutdownto ensure that this happens before theutilityglobal variables are destroyed.