crypto: don't overwrite existing GODEBUG settings
Some tests set GODEBUG by calling t.Setenv("GODEBUG", "foo=bar").
This overwrites any existing GODEBUG settings, which is undesirable.
Instead, append the new setting to any existing GODEBUG settings.
As this operation is quite common, add a helper function
testenv.SetGODEBUG to do this.
Change-Id: Ie7905483e87ec4c4a448511a7dd53c18939577fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/734400
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Mark Freeman <markfreeman@google.com>
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