Skaled does not exit gracefully when it unable to connect to 2/3 nodes.

[badrogger]

Describe the bug
Skaled exits gracelessly when it cannot connect 2/3 peers.

To Reproduce
Steps to reproduce the behavior:

1. Run skale chain (3.17.0-develop.62)
2. Turn off skale admin container.
3. Disconnect the node from the network.
4. Observe how skaled exits.

Expected behavior
Skaled should exit gracefully.

Actual behavior
Skaled crashes during exit procedure with the following error (more logs attached):

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::log::v2s_mt_posix::system_error> >'
pure virtual method called
terminate called recursively

Caught (first) signal. Signal SIGABRT(6). This is the abort signal. Typically, a process will initiate this kill signal on itself.

more-skaled-exiting.log

[dimalit]

Dispatch: All threads stopped
Dispatch: All dispatch queues removed

  /home/dimalit/skaled/build/skaled/skaled : dev::ExitHandler::exitHandler(int, dev::ExitHandler::exit_code_t)+0x44d [0x5647749d187d]
  /home/dimalit/skaled/build/skaled/skaled : dev::ExitHandler::exitHandler(int)+0x1e [0x5647749d07ae]
  /lib/x86_64-linux-gnu/libc.so.6 : ()+0x42520 [0x7f38864bd520]
  /lib/x86_64-linux-gnu/libc.so.6 : pthread_kill()+0x12c [0x7f3886511a7c]
  /lib/x86_64-linux-gnu/libc.so.6 : raise()+0x16 [0x7f38864bd476]
  /lib/x86_64-linux-gnu/libc.so.6 : abort()+0xd3 [0x7f38864a37f3]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xb042a [0x7f388685c42a]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xae20c [0x7f388685a20c]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xae277 [0x7f388685a277]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xaefa5 [0x7f388685afa5]
  /home/dimalit/skaled/build/skaled/skaled : boost::system::error_code::message[abi:cxx11]() const+0x5b [0x564774575863]
  /home/dimalit/skaled/build/skaled/skaled : boost::system::system_error::what() const+0x9f [0x564774575e9d]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xa2b5d [0x7f388684eb5d]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xae20c [0x7f388685a20c]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : ()+0xad1e9 [0x7f38868591e9]
  /lib/x86_64-linux-gnu/libstdc++.so.6 : __gxx_personality_v0()+0x99 [0x7f3886859959]
  /lib/x86_64-linux-gnu/libgcc_s.so.1 : ()+0x16884 [0x7f38866b9884]
  /lib/x86_64-linux-gnu/libgcc_s.so.1 : _Unwind_Resume()+0x12d [0x7f38866ba2dd]
  /home/dimalit/skaled/build/skaled/skaled : boost::log::v2s_mt_posix::sources::basic_composite_logger<char, boost::log::v2s_mt_posix::sources::severity_channel_logger_mt<int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::log::v2s_mt_posix::sources::multi_thread_model<boost::log::v2s_mt_posix::aux::light_rw_mutex>, boost::log::v2s_mt_posix::sources::features<boost::log::v2s_mt_posix::sources::severity<int>, boost::log::v2s_mt_posix::sources::channel<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::open_record()+0xbf [0x5647745d1bbf]
  /home/dimalit/skaled/build/skaled/skaled : SkaleHost::stopWorking()+0x8c [0x564774825fc0]
  /home/dimalit/skaled/build/skaled/skaled : dev::eth::Client::stopWorking()+0x71 [0x56477477596b]
  /home/dimalit/skaled/build/skaled/skaled : dev::eth::Client::~Client()+0x47 [0x56477477565f]
  /home/dimalit/skaled/build/skaled/skaled : dev::eth::EthashClient::~EthashClient()+0x8f [0x5647748f249f]
  /home/dimalit/skaled/build/skaled/skaled : dev::eth::EthashClient::~EthashClient()+0x1c [0x5647748f24ce]
  /home/dimalit/skaled/build/skaled/skaled : std::default_delete<dev::eth::Client>::operator()(dev::eth::Client*) const+0x2c [0x5647745e5920]
  /home/dimalit/skaled/build/skaled/skaled : std::unique_ptr<dev::eth::Client, std::default_delete<dev::eth::Client> >::~unique_ptr()+0x56 [0x5647745d4fba]
  /lib/x86_64-linux-gnu/libc.so.6 : ()+0x45495 [0x7f38864c0495]
  /lib/x86_64-linux-gnu/libc.so.6 : on_exit()+0 [0x7f38864c0610]
  /home/dimalit/skaled/build/skaled/skaled : Schain::healthCheck()+0x363 [0x564774cd1d55]
  /home/dimalit/skaled/build/skaled/skaled : Node::startClients()+0x3a [0x564774bead0a]
  /home/dimalit/skaled/build/skaled/skaled : ConsensusEngine::startAll()+0x802 [0x564774ba4738]
  /home/dimalit/skaled/build/skaled/skaled : ()+0x1f24551 [0x564774825551]
  /home/dimalit/skaled/build/skaled/skaled : ()+0x1f28890 [0x564774829890]

[dimalit]

As a solution, I'd propose not to call exit() directly from consensus, but use ConsesusExtFace::terminateApplication() instead

[kladkogex]

Moving to 2.5 since we do not have time for this in 2.4