Back in the before time, the best practices surrounding usage of Context
weren't quite worked out. We defined our own type to make usage easier.
As this packaged was used elsewhere, it make it more and more
challenging to integrate with the forked `Context` type. Now that it is
available in the standard library, we can just use that one directly.
To make usage more consistent, we now use `dcontext` when referring to
the distribution context package.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
This adds WithTrace function to the context package that allows users to trace
a time span between a trace allocation and returned function call. The
resulting context includes ids that will allow for future dapper-like analysis.
Please see the godoc addition for details.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
