Have .dockerignore support Dockerfile/.dockerignore

If .dockerignore mentions either then the client will send them to the
daemon but the daemon will erase them after the Dockerfile has been parsed
to simulate them never being sent in the first place.

Closes #8330

Signed-off-by: Doug Davis <dug@us.ibm.com>
ick. This needs to be well defined first. Who wins, `includes` or `excludes`? 
If i exclude "*", but include "*ocker*"
if i include "*", but exclude "*ocker*"
if i include and exclude "Dockerfile"