vdagentd: work around GLib's fork issues
    
    Creating threads is not compatible with forking as only the thread
    that calls fork() is inherited.
    
    Handlers registered with g_unix_signal_add() create a thread so
    move these calls after fork.
    
    Also call g_socket_service_start() after fork to avoid creation of
    new threads before it is necessary.
    
    Fixes: https://gitlab.freedesktop.org/spice/linux/vd_agent/issues/18
    
    Also see: https://gitlab.gnome.org/GNOME/glib/issues/2073
    
    Signed-off-by: Jakub Janků <jjanku@redhat.com>
    Acked-by: Frediano Ziglio <fziglio@redhat.com>
    (cherry picked from commit 9b8c0ebb9fb573e6ce3c5416371509f416503d0c)
    
    patch_name: 0001-vdagentd-work-around-GLib-s-fork-issues.patch
    present_in_specfile: true
    location_in_specfile: 1
    squash_commits: true