Enable the dkms addon for debhelper.

Support for releases older than Ubuntu 12.04 LTS Precise Pangolin is
discontinued.
Normalize the override_dh_auto_install rule.

Move dh_install, dh_installinit, and dh_installudev commands into separate
overrides.

Move chmod commands into override_dh_fixperms and force the permissions onto
the build targets instead of the bundled tree, which should be read-only.
Drop upstream component removal patches.

The packaging overlay bundles optimized components that supercede some generic
upstream components. These components were patched-out of the upstream sources
to prevent build problems on older systems that are now unsupported.
Prune unnecessary components in the DKMS distdir.

In the zfs-dkms package, only bundle components that are actually used to
compile the ZoL kernel modules. This prevents several lintian complaints,
discourages users from running `make install` in /usr/src, and reduces the
binary package size by one third.

Also shorten `cp` shunt creation to a one-liner.
Add expat license to the debian/copyright file.

Resolve this lintian warning:

	W: zfs-linux source: missing-license-paragraph-in-dep5-copyright expat (paragraph at line 1260)
Update packaging to standards version 3.9.5

Resolve this lintian warning:

	W: zfs-linux source: ancient-standards-version 3.9.3 (current is 3.9.5)
Reindent descriptions in the debian/control file.

Resolve these lintian warnings:

	W: libuutil1: possible-unindented-list-in-extended-description
	W: libuutil1-dbg: possible-unindented-list-in-extended-description