Generate internal should use add "_internal" to the test name

[kevinkirkup]

When running the ginkgo generate -internal it creates a test file with the same name as without the -internal flag.
Most of the time I want to generate white box and blackbox tests.

It would be handy if adding the -internal flag would add _internal to the generated file name:

$ something_internal_tests.go

From looking around, it looks like this is a convention for internal tests.

[onsi]

SGTM - are you up for submitting a PR for this?

[kevinkirkup]

yes