Rename cdutil interface to deviceutil

cdutil is a concrete implementation of deviceutil

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Add DiskUtil to read contents of disk

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Move cdutil, diskutil to cdrom, disk packages accordingly

deviceutil only defines interface and fake

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Add GetFileContentsFromDisk to linux platform

It is using DiskUtil to mount disk to temporary folder, read file and unmount it

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Create config drive metadataservice if UseConfigDrive is set

* Fall back to http metadata service if config drive service fails to load
* Split out metadata service for aws and openstack

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Resolve registry endpoint

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Set userdata and metadata paths in openstack metadata service provider

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Add logs to config drive metadata service

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Prefer Godeps path to base go path

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Fail earlier if disk path does not exist

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>
Read all files from disk at once

Instead of mounting and reading one file per request, read
all the required files to speed up the boot process

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>