wait_for does always in "deferred" state for calls on remote localities

[KADichev]

wait_for does not work as expected for calls on remote localities. Even after the remote call successfully completes, wait_for returns "deferred". The bug can be reproduced with many examples, e.g. this one:

#include <hpx/hpx_init.hpp>
#include <hpx/include/lcos.hpp>
#include <hpx/include/actions.hpp>


#include <chrono>

#include <iostream>

void f();
HPX_PLAIN_ACTION(f, f_action);

void f() 
{
    std::cout << "Calling empty f\n";
}

int hpx_main(boost::program_options::variables_map &vm)
{
    auto remotes = hpx::find_remote_localities();
    if (remotes.size() == 0) {
        std::cout << "Need at least 2 localities!\n";
        return -1; 
    }   
    auto fut = hpx::async<f_action>(remotes[0]);
    auto status = fut.wait_for(std::chrono::seconds(3));
    if (status == hpx::lcos::future_status::deferred)
        std::cout << "Status deferred after waiting for 3 seconds in a trivial function!\n";

    hpx::finalize();
    return 0;
}

int main(int argc, char* argv[])
{
    boost::program_options::options_description description("Bug");
    return hpx::init(description, argc, argv);
}

[hkaiser]

@KADichev thanks for reporting this, we'll have a look asap.