[runtests-utils] List files only once

Listing this file twice was generating a warning in the build.

Test: Compiles
Change-Id: I0e6f02c3b961268e2126bd5231cbfdffddaf6d75

[runtests] Support publishing data through sinks

This enables persisting data published through sanitizer data sink and
publishing them through summary.json file. The loader service is only
changed when the output directory is set and the output directory is
used as the data sink path.

TC-27

Test: runtests-utils
Change-Id: Id76037451a79bf247d8f07046b1f7d8f6ee0c773

[runtests] Run tests as components if possible

Changed runtest to first search for cmx file for a test binary, if
found, it will use run_ctest from garnet to execute it as a component.

CP-115 #done

TEST=normal manual testing

Change-Id: Ic006d9fbb6e7047156de3dc57334f82ea104104d

[fidl] Rename FIDL directories

These names more closely match what we publish in the SDK. Ideally, we'd
use . as the separator, but Zircon's build system cannot handle . in
directory names, so we use - instead.

Test: Builds.
Change-Id: Ia420a364d2accac39faebade8f3f8ed72088556a

[runtests] Define PosixRunTest() for running host tests.

Note: runtests-utils-test passes as a host test.

BUG: IN-358
Change-Id: I9f0380b4d3c38c6fea5950638e5eb0cfaa1ab3d3

[memfs] Split memfs into C / C++ libraries

For clients which utilize memfs to create
temporary filesystems, export a C ABI shared
library.

Internally, this C library uses a C++ library,
which is exported as source.

Change-Id: I73b95a2a2b8c4870d1b07f5f2f2525f4b0cd4e9f

[runtests] Add support for reading syslogs.

IN-320 #progress

Change-Id: Icac7a0d5d8d877d444f064f0f8b5a48f12563fdc

[runtests] Move most code into runtests-utils and test it.

Use C++ features (rather than pure C) where possible to make
code cleaner.

Change in testing tactics:
Previously the test used its own path as the executable to be used for
testing. Switched to writing shell scripts to MemFS.
This is more flexible; it allows putting binaries in arbitrary
directories.
I think it's also more readable.

Bug: IN-223 #done
Change-Id: I66b31bf129e77be704361275a37cbdd8df9db672

[runtests] More C to C++.

Main changes:
* CamelCase instead of snake_case names, in accordance with our C++
style guide.
* Use fbl::Vector instead of list_node.
* Use fbl::MakeAutoCall and objects that clean themselves up on
destruction instead of "goto fail".
* Potential bug fix: check if get_info() return val != ZX_OK, rather
than previously checking if it was negative.
* Behavior improvement: insert a TestRun into the tests vector for all
failure modes. Previously we would only do this if we got to
launchpad_go(). There's no reason for the result to not be saved if
the failure comes earlier than that.

Bug: IN-223
Change-Id: Ib6cce2682c1ed5b2d15c13d5c193558eae2f8e88

[runtests] Move some of runtests into a library.

Add unit tests for the library.
Unit tests are not exhaustive because AFAIK there's no existing
way to control the behavior of launchpad in unit tests.

Changes to the actual code are minimal because:
* I want to have the tests in place before making any more changes
* To keep this change conceptually focused on just a few things
(moving code + adding testing).

Future changes will make the code take advantage of more C++ features.

Bug: IN-223
Change-Id: I29a8c43e8b96db56b07f84e8f5a00cb6bd232690