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Several fixes to make net_unittests compile for Fuchsia:
 1. Added cert_database_fuchsia.cc and test_root_certs_fuchsia.cc.
 2. Disabled Kerberos (not implemented on Fuchsia).
 3. Updated CertVerifyProc to use CreateCertVerifyProcBuiltin() with
    OS_FUCHSIA. Currently it uses DummySystemTrustStore, so cert
    verification will always fail. This will need to be fixed later,
    once Fuchsia adds an API for root certs store.
 4. res_ninit() is not yet implemented, so res_init() is used instead.
 5. Disabled DnsReloader. It relies on res_ninit() and it's unlikely
    to be useful on Fuchsia.

Bug: 731302
Change-Id: I05cbb7a4b571d82894b7c62740fc2f5b36870214
Reviewed-on: https://chromium-review.googlesource.com/560050Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485440}