Import NetBSD shell environment files

With the import of Xorg, a proper separation between login-time and sub
shell-time of the environment setup is necessary.

Instead of re-developping this from s

Import NetBSD shell environment files

With the import of Xorg, a proper separation between login-time and sub
shell-time of the environment setup is necessary.

Instead of re-developping this from scratch, I am taking the opportunity
to import the NetBSD default environment.

Change-Id: Ib6a8fbd9c2f407ccd59be57a52ef9df21c2c9ce7

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