[Eglide] Base software for generic shell servers

Summary:
We want to provide a choice of shells, editors and generic UNIX utilities
allowing to use the server.

Test Plan: salt eglide state.sls roles/shellserver/userland-software/base

Reviewers: Sandlayth

Subscribers: tomjerr

Maniphest Tasks: T767

Differential Revision: http://devcentral.nasqueron.org/D355