test/testenv: don't Put test keys to key.test.upspin.io
test/testenv: don't Put test keys to key.test.upspin.io

This bit of code was written when we assumed the integration
tests would only ever run against an inprocess key server.

Now that we're using key.test.upspin.io in the remote integration test,
there's no reason to do the Put; the keys already exist there.

Change-Id: I25f00e7dd01ffaf1e8ea3d9d7426a47c5db2d499
Reviewed-on: https://upspin-review.googlesource.com/8102
Reviewed-by: David Presotto <d244755566b06d4c956c05eb7fe29c9fb345f41e@gmail.com>

upspin/upspin,upspin/upspin