make KernelManager configurable for all who inherit JupyterConsoleApp

[mpacer]

No description provided.

[mpacer]

@rgbkrk @takluyver @Carreau @minrk Do any of you have any comments on this?

[rgbkrk]

My only real question is if we have to bear in mind what the NotebookApp or others already use for this field. If it overlaps, does it maintain the same purpose? (I do realize the notebook app has the two related classes, one for the single base and one for the mapping kernel manager).

[mpacer]

The NotebookApp doesn't use this field — it is using NotebookApp.kernel_manager_class which does not inherit from JupyterConsole and so would have no way to access JupyterConsole.kernel_manager_class.

As far as I can tell there are two main uses of the JupyterConsole application:

• juptyer_console (which does not overwrite this attribute and so will inherit it appropriately)
• qtconsole (which overwrites this attribute to be QtKernelManager thus will not be able to inherit this value)

Are there other known uses of the JupyterConsole application?