fixup! Giant refactor to move all state into a Kernel struct

Author: JamesWrigley

src/IJulia.jl

@@ -204,7 +204,7 @@ function Base.close(kernel::Kernel)
     close(kernel.raw_input[])
     close(kernel.requests[])
     close(kernel.control[])
-    close(kernel.heartbeat_context[])
+    stop_heartbeat(kernel)
 
     # The waitloop should now be ready to exit
     kernel.inited = false

test/kernel.jl

@@ -78,7 +78,7 @@ function make_request(request_func, get_func, args...; wait=true, kwargs...)
     end
 
     result = Ref{Py}()
-    timeout = haskey(ENV, "CI") ? 120 : 10
+    timeout = haskey(ENV, "CI") ? 120 : 20
     if timedwait(() -> test_py_get!(get_func, result), timeout) == :timed_out
         error("Jupyter channel get timed out")
     end