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This CL adds an option for generating test certificates with custom
subject alternative name (SAN). This is important e.g. for testing of SAN matching in isolation.

Bug: 1030652
Test: Metadata of generated certificates has not changed (inspected manually).
Change-Id: I95c5003b46e4a78fb176c4d330571e22fc2b5f2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949797
Commit-Queue: Omar Morsi <omorsi@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722422}