context use: skip validation for "default" context
context use: skip validation for "default" context

This code was handling validation and parsing, only to discard the
results if it was the default context.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

cpuguy83/cli,thaJeztah/cli,thaJeztah/cli,cpuguy83/cli,docker/cli,docker/cli