version-handler: Refactor handler construction

Instead of requiring callers to build maps and info blobs, take the
minimal required amount of information about the blob configuration and

version-handler: Refactor handler construction

Instead of requiring callers to build maps and info blobs, take the
minimal required amount of information about the blob configuration and
build required datastructures internally.

This reduces the amount of code, and nearly eliminates all of the
untested code in main.cpp.

Change-Id: Iaa398eb404814e9263e6707b71b38a9831d96697
Signed-off-by: William A. Kennington III <wak@google.com>

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version-handler: add version-handler, blob handler

Implement version-handler: a blob handler for retrieving version
information about a blob.

Problem: ipmi-flash(firmware-handle

version-handler: add version-handler, blob handler

Implement version-handler: a blob handler for retrieving version
information about a blob.

Problem: ipmi-flash(firmware-handler) provides a mechanism to transfer
firmware updates, verify them and perform updates but there is no
mechanism to interrogate the firmware for its version.

Solution: version-handler provides handlers for retrieving information
about firmware blobs. Adding "version" syntax to "/flash/blob" entries
in the json configuration file enables this feature.
The mechanism to retrieve version is identical to the mechanism used by
firmware-handler to perform preparation, verification and updates (kick
off systemd targets).

Signed-off-by: Jason Ling <jasonling@google.com>
Change-Id: I28868ca8dd76d63af668d2e46b9359401d45f0bc

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