cmd/keyserver: fix -http flag to run in insecure mode
cmd/keyserver: fix -http flag to run in insecure mode

Fix #420

Change-Id: I48d4c6ac1250e8ee53de3ee39af2cdcc4bc84a57
Reviewed-on: https://upspin-review.googlesource.com/10640
Reviewed-by: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

upspin/upspin,upspin/upspin