Revert "Use ocamldep -all option."

This reverts commit a3881445efd04d5fe6da29db8b2d62a30088b9d1.

See discussion on the mailing list:

https://www.redhat.com/archives/libguestfs/2014-September/msg00069.html
v2v: Add stringMap.mli (interface).

Hopefully this should fix the incorrect build problem.  See discussion
here:

https://www.redhat.com/archives/libguestfs/2014-September/msg00071.html

The interface was generated using 'ocamlc -i'.
Generate *.cmx targets only if a native OCaml compiler exists
Revert "v2v: -i libvirtxml: Give an error if local disks are not readable (RHBZ#1140946)."

This commit breaks remote disks.  See:
https://bugzilla.redhat.com/show_bug.cgi?id=1141654

This reverts commit 73c1f1cf7e1c4aa4e70407feff49ba847f7ebb63.
v2v: domainxml: Rework libvirt error handling.

Don't rely on libvirt's implicit print-to-stderr.  Instead make sure
that libvirt error messages are raised in the exception message.

Also allow error strings to be translated.
v2v: Allow domain UUID to be used in place of libvirt guest name (RHBZ#1141680).

Thanks: Zhou Junqin.
v2v: Allow pool UUID to be used in -os parameter (RHBZ#1141631).

Thanks: Zhou Junqin.
Version 1.27.46.
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.