v2v: Remap device in /etc/sysconfig/grub boot= entry.

Old virt-v2v did not remap this device, so after conversion from Xen
the file would have something like:

  boot=/dev/xvda

Although this does not appear to affect anything, better to remap it.
tests: Add drivers directory to phony Windows image.

Allows virt-v2v to upload drivers.
v2v: tests: Don't care about the <model> XML when testing network and bridge mapping.
v2v: windows: Set filename correctly when uploading virtio drivers (RHBZ#1145916).

Thanks: Jeff Forbes, Alain Vondra, Junqin Zhou
v2v: Update list of virtio-win drivers to latest (RHBZ#1145908).

Update with latest list from:
- virtio-win-1.7.2-1.el7.noarch
- https://en.wikipedia.org/wiki/List_of_Microsoft_Windows_versions
v2v: Failure to mount the root partition is a hard error.

For other partitions, it is a warning.
v2v: windows: Give a better message when Fast Restart is found (RHBZ#1145995).

Thanks: Tingting Zheng
Version 1.27.54.
RHEL 7: Emphasize libguestfs-winsupport package (RHBZ#627468).

This RHEL-only patch changes the error messages when the
inspection code cannot find an operating system inside the guest
image.  For a Windows guest this may happen because the user has not
installed the separate 'libguestfs-winsupport' package.  Therefore we
emphasize that the user may need to install this package.

Notes:

(1) In RHEL there are two pieces of inspection code, the old Perl code
(deprecated upstream) and the new C core inspection API.  Therefore
this patch has to touch two places with essentially the same change.

(2) This patch doesn't try to be clever and detect if it was a Windows
guest.  This should reduce the chance of failure.

Output from (Perl) virt-inspector now looks like this:

 $ virt-inspector disk.img
 No operating system could be detected inside this disk image.

 This may be because the file is not a disk image, or is not a virtual machine
 image, or because the OS type is not understood by virt-inspector.

 If you feel this is an error, please file a bug report including as much
 information about the disk image as possible.

 RHEL notice
 -------------
 libguestfs will return this error for Microsoft Windows guests if the
 separate 'libguestfs-winsupport' package is not installed. If the
 guest is running Microsoft Windows, please try again after installing
 'libguestfs-winsupport'.

Output from guestfish (ie. C core inspection API) now looks like this:

 $ guestfish -i disk.img
 guestfish: no operating system was found on this disk

 RHEL notice
 -------------
 libguestfs will return this error for Microsoft Windows guests if the
 separate 'libguestfs-winsupport' package is not installed. If the
 guest is running Microsoft Windows, please try again after installing
 'libguestfs-winsupport'.
RHEL 7: Remove libguestfs live (RHBZ#798980).

This isn't supported in RHEL 7.
RHEL 7: Remove 9p APIs from RHEL (RHBZ#921710).
RHEL 7: Disable unsupported remote drive protocols (RHBZ#962113).

This disables support for unsupported remote drive protocols:

 * ftp
 * ftps
 * http
 * https
 * tftp
 * gluster
 * iscsi
 * rbd
 * sheepdog
 * ssh

Note 'nbd' is not disabled, and of course 'file' works.

We hope to gradually add some of these back over the lifetime of RHEL 7.
RHEL 7: Remove User-Mode Linux (RHBZ#1144197).

This isn't supported in RHEL 7.