[fvm][zxcrypt] Refactor libraries to avoid fdio dependency

ZX-2266 #done

Test: Refactor; relying on exitant library/driver tests.

Change-Id: Ia54acac0fb8056c91b26c097a8efae22dd0c5b3a

[fvm] Avoid using bitfield in on-disk structures.

Additionally, add documentation, and distinguish
between PSLICE_UNALLOCATED and FVM_SLICE_ENTRY_FREE
more clearly.

Change-Id: If36baf7383f10712d4ca47107392e5a18f82d9b9

[fdio] Move headers into lib/fdio/...

Change-Id: Ie8d74e716da913bf6e2672c4acf8cd67b4962b7f

[fvm] Rename partition allocation/destruction ioctls

The name "fvm_destroy" was misleading; this ioctl
freed a single partition, not the entire FVM, and
was also overloaded with a helper in the fvm ulib
having the same name.

Update "fvm_alloc"'s name as well for symmetry.

Change-Id: I5052da5287406e1399912b7d55e2e126bb821188

[blobfs] Improve cleanup of unit test

At the beginning of each blobfs test run, search for any existing
partitions that match the unique test GUIDs and eradicate them.

Also ensure that allocated resources are cleaned up at the end
of each test, regardless of whether the test passed or failed.

ZX-1878 #done

Change-Id: I3f52aa9edb62d221475f5d72f03cace6b995c378

[zx] Move public zx headers to match naming convention

The zx library provides headers intended for general use, so the
include path should be spelled <lib/zx/foo.h> as per
https://fuchsia.googlesource.com/docs/+/master/development/languages/c-cpp/naming.md.
This moves the headers into the proper location and updates includes to
match.

Change-Id: I6fc9b2a491b5f8b0d270c4dfc77fa4be5739071b

[fvm] Fix path-based buffer overflow

... and while I'm there, fix an fd leak.

ZX-1808 #done

Change-Id: Ieb8a1ab6825916eb7b15e46de0657f2b2b628416

[crypto][fdio][zxcrypt] Improve debug output

This CL improves fdio/debug's xprintf with location info.

Change-Id: Idd05c0439258ed3fe160086bcce05575eddbc38b

[block] Larger-than-device requests should fail, not truncate

ZX-1545 #comment In Progress

Change-Id: I456c71c1b093791d1e21855849d566726a4c0544

[fvm] Provide target-side functionality for streaming sparse FVM to disk

- If a "--fvm" file is provided to the bootserver, it will be
transferred to the target device and paved onto disk. Similarly, if an
"--efi" provided to the bootserver, it will be paved onto a GPT
partition (separately from the first partition in the GPT, to avoid
dual-booting issues).
- Netsvc has been augmented so the tftp protocol can interpret
FVM and EFI files separately from netboot files, and appropriately
stream them to the FVM installer as they arrive.
- "install-disk-image" is a new application, capable of reading from
stdin (which is supplied from netsvc as a pipe) which parses the
images, and writes them to disk.

ZX-1194 #done

Change-Id: Idd6b05d7b4ff8cff81635747cc90e724f2e342d1

[fvm] Add support for atomically upgrading between VPartitions

ZX-1194 #comment In Progress

Change-Id: I3f0d6eb8cbd78c4e7d2920803483a1d0d8046a9a

[fvm] Add host-side tool

Example usage:
truncate --size=1g blobfs.bin;
./build-zircon-pc-x86-64/tools/blobstore blobfs.bin create
./build-zircon-pc-x86-64/tools/fvm sparse.bin sparse --blobstore blobfs.bin

Change-Id: Ifc44ea30d0cf68e3914d4e8591fa8c65998ba9ce

[fvm] Add test support for real block device

Change-Id: I917b2e8593d381f46ca6604222806ebe31eb5e85

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[zircon][mxtl->fbl] Rename mxtl to fbl

Change-Id: Ie21b6498e1bfb0a7fa0315e40b9e5c3ee78646be

[blobstore] Make blobstore mountable on FVM

Also update the blobstore tests accordingly

Change-Id: I1e697c8db1c1fa2b1a07aaff898e5ddce81e0e64

[fvm] Extract FVM allocation helpers out of tests, into ulib

Change-Id: I18d157019c3d99e12aa563050d45cc3bb5459dcd

[fvm] Add support for runtime-dynamic slice size

Change-Id: I76ae3f943e9fd26dd2cdd47f014e67985eb287b1

[fvm] Initial commit of Fuchsia VPartition Manager

Change-Id: I1dd488889dd440814277629ffbcfd6d57cf30f47