tests: Add a regression test for iface launch hangs (RHBZ#975797).

Cherry picked from commit d8a3185823e608dbddbc6185209951140b8f3b33
and some corrections made for libguestfs 1.20.
virt-resize: Fix minor typo in error message.
(cherry picked from commit 7949fd3949c300ec70b85b40d8ac7a9d651cd4af)
virt-resize: Add some more debugging messages.

These are only printed when using the --debug flag and are
helpful for diagnosing problems.
(cherry picked from commit 07f3e5ae5cba03d29c5b9675c7f137463b29d424)
virt-resize: Take into account large start offset of the first partition when calculating overhead (RHBZ#974904).

Since we don't usually move the first partition, if the first
partition has an unusually large offset from the start of the disk,
then the unpartitioned space in front of that partition counts as
partitioning overhead.  However the previous surplus calculation was
not taking that into account.

This was a problem for certain Ubuntu images which are partitioned
with an 8 MB gap before the first partition.

Thanks: David Hart.
(cherry picked from commit b730bc0c4685887232daed8fafa491b28f38c300)
virt-resize: Add notes about Windows and disk consistency (RHBZ#975753).

Also group the Windows-related notes together.

(cherry picked from commit a7aa47f4de7c61620c92f95ceb2d6de833152574)
sysprep: New operation to remove RPM database files.

See:
https://lists.fedoraproject.org/pipermail/devel/2013-June/184389.html
(cherry picked from commit dd21bec4009ad6a65be1634b513be50ee668a63a)
daemon: Verify ext2/3/4 filesystem name before passing to mke2fs (RHBZ#978302).

Add a utility function (fstype_is_extfs) to match ext2/3/4 filesystem
names.  This is used in a couple of places.

When passing the mke2fs -t parameter, verify that the request is for
an ext2/3/4 filesystem.  Previously we did not check this, and neither
did mke2fs when the -F flag was also used.

(cherry picked from commit fb0bd82dbe9c3cad40312e89de5b61195f5fd889)
configure: python: RHEL 6 doesn't have sysconfig, use distutils.sysconfig instead.

This works on recent Python as well.
(cherry picked from commit cd9f40945d45f2f44d3986f15dc9b82bd03ac7dc)
RHEL 6: Emphasize libguestfs-winsupport package (RHBZ#627468).

This RHEL 6.1-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 6.1 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 6 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 6 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 6: Require external hex editor set with $HEXEDITOR.

RHEL 6 doesn't have the hexedit program or any suitable replacement.
Require that the user sets $HEXEDITOR to make this command work.
(cherry picked from commit 1ee31426e13446bc5fcce242eb496a01d8a78d8c)
RHEL 6: Directly include String::ShellQuote.

Directly include a snippet from String::ShellQuote so that we
don't need to depend on this external library, which is not
included in RHEL 6.1.

This affects virt-make-fs.
RHEL 6: Modify blkid test so it is successful on RHEL 6-era blkid.
RHEL 6: Remove libguestfs live (RHBZ#798980).

This isn't supported in RHEL 6.
RHEL 6: Exclude iptables from the appliance (RHBZ#858648).
RHEL 6: In mount-local docs, change refs to libguestfs 1.18 -> RHEL 6.4.

We backported the libguestfs 1.18 / mount-local functionality
into the libguestfs 1.16 codebase for RHEL 6.4.
RHEL 6: Ignore /etc/release if /etc/redhat-release exists (RHBZ#872454).

If the user has created /etc/release on a RHEL machine, don't
mis-detect the OS as NetBSD.
RHEL 6: Modify ruby Rakefile.in to work with older Ruby.
RHEL 6: Remove check for qemu >= 1.
RHEL 6: Revert "Use pkg-config for Python"

Python in RHEL 6 does not contain the required pkg-config files.

This reverts commit e5f0dfb6e3425e8dbaa405847ae98a8dcc421da7.
RHEL 6: tests/regressions/rhbz895904.sh: Use `` instead of $().

Apparently bash in RHEL 6 cannot handle this unusual
multi-line use of $(...), but `` works fine.