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whom-diff: watch login/logout for csh and tcsh

Description

whom-diff: watch login/logout for csh and tcsh

Summary:
Allow to be notified from login/logout on a shell server.

Fixes T543.

Test Plan: Installed on Ysul.

Reviewers: dereckson, Kaliiixx

Maniphest Tasks: T543

Differential Revision: http://devcentral.nasqueron.org/D137