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Update the functions we register as FIDL error handlers to use :
- ZX_LOG(FATAL, status) where we never expect to lose connectivity,
  e.g. for connections to system services such as the Netstack. We
  typically follow these with an indication of what disconnected, e.g:
    ZX_LOG(FATAL, status) << " Netstack disconnected.";
- ZX_LOG_IF(FATAL, status != ZX_ERR_PEER_CLOSED, status) where we are
  providing service to a single peer that may disconnect from us at any
  time, where other status values are unexpected.
- ZX_LOG(ERROR, status) where we never expect to lose connectivity, but
  are serving multiple peers, so must not simply crash the process.
- ZX_LOG_IF(ERROR, status != ZX_ERR_PEER_CLOSED, status) where we are
  providing service to multiple peers that we expect may disconnect, to
  verify that they do so gracefully.

We also update FIDL error handlers in some test suites:
- EXPECT_EQ(status, ZX_ERR_PEER_CLOSED) where the test actively expects
  that the FIDL channel will be disconnected gracefully.
- ZX_LOG(ERROR, status) where the test does not expect FIDL errors.

Bug: 927400
Change-Id: I10fef90778e58f2aedadb806f857da00aace96aa
Reviewed-on: https://chromium-review.googlesource.com/c/1448796
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628524}