Improve the no-interactive-shell error message over SSH

Present users with a more useful message that explains they have
logged in, but aren't able to run commands directly through SSH.

Change-Id: I9763ae6f28c2dd2aa7a3f3e41a9b13ef997a1f45
Signed-off-by: Shawn O. Pearce <sop@google.com>
2 files changed