The klish cannot ignore Ctrl+Z in one scenario

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If change user from normaly linux console, i.e. "su - username", and enter into 
klish console, when executing command, the Ctrl+Z can stop the on-going process.

But if login directly as klish user, Ctrl+Z seems defautly could be ignored.

Thanks.

Original issue reported on code.google.com by [e-mail] on 2 Jan 2014 at 6:13