PATCH: Break out _GetShell in ShellScriptTest

[Mark Mitchell]

This patch makes it possible for classes derived from ShellScriptTest to 
use a different default shell.  For example, if you want to use 
ShellScriptTest to run Python tests, you can know use a derived class 
that defaults to "/usr/bin/env python" for the shell, rather than 
requiring users to explicitly set ShellScriptTest.script_shell in their 
context file.

-- 
Mark Mitchell
CodeSourcery, LLC
mark at codesourcery.com
(916) 791-8304
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