imports: adjust tests to check vendored packages again (fix build)
imports: adjust tests to check vendored packages again (fix build)

Change-Id: I616dccc07c255bb7ca1146ad0d37d05999eeb772
Reviewed-on: https://go-review.googlesource.com/21142
Reviewed-by: Alan Donovan <7069e9552f9d110b0a0f326b96f22f63fb99dfc1@google.com>

golang/tools,syreclabs/go-tools,syreclabs/go-tools,syreclabs/go-tools,golang/tools,syreclabs/go-tools,golang/tools,syreclabs/go-tools,golang/tools,golang/tools,syreclabs/go-tools