tls: allow verify_certificate_{spki,hash} without trusted_ca. (#3549)
tls: allow verify_certificate_{spki,hash} without trusted_ca. (#3549)

*Risk Level*: Low
*Testing*: bazel test //test/...
*Docs Changes*: n/a
*Release Notes*: Added

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 10030eb8b6a56da99a61ead5213f660ed9a3d545

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api