variants: remove the ia64 build variant

we no longer have access to ia64 hardware for building sie-dns-sensor
packages and it is unlikely we will need to continue supporting this
platform, so remove the ia64 build variant.
variants: debian 6.0 -> debian 7

debian 7 'wheezy' has now been 'stable' for almost a year, so let's
switch from 'oldstable' to 'stable' for our debian package builds.
tarballs/nmsg-0.7.3.tar.gz
tarballs/wdns-0.5.tar.gz
tarballs/rsync_3.1.0.orig.tar.gz
build-deps/: add debian-7-amd64
build-deps/: add debian-7-i386
scripts/nmsg_build.sh: install nmsgtool as 'sie-nmsgtool' and use private library directory

to avoid conflicting with another nmsgtool/libnmsg installed on the
system, we need to install nmsgtool to a path other than
/usr/bin/nmsgtool, and the libnmsg library and plugins need to be
installed into a private directory.

here we use '/usr/bin/sie-nmsgtool' for the nmsgtool utility,
'/usr/$lib/sie-dns-sensor' for the private library directory, and
'/usr/$lib/sie-dns-sensor/nmsg' for the private library's plugin
directory.

also, we don't actually need the 'libnmsg.so' symlink, so avoid copying
that symlink into the output directory. ("*.so*" -> "*.so.*")
debian/control: update Maintainer and Standards-Version
debian/changelog: ISC -> FSI
sie-gen-key: ISC -> FSI
known_hosts: remove "*.sie.isc.org"

(also change "submission server" -> "submission service" in the key description.)
sie-functions: "nmsgtool.pid" -> "sie-nmsgtool.pid"
debian: nmsgtool/libnmsg path changes

the 'nmsgtool' path has changed:

    /usr/bin/nmsgtool -> /usr/bin/sie-nmsgtool

the 'libnmsg' shared library and plugin has moved into a private library
directory:

    /usr/lib/ -> /usr/lib/sie-dns-sensor/

this avoids conflicting with the nmsg packages provided via the
debian-farsightsec repository.
debian/control: remove "Conflicts: nmsgtool"

we now no longer conflict with the 'nmsgtool' package as
sie-dns-sensor's nmsgtool binary is now installed as
/usr/bin/sie-nmsgtool.
debian: rename '/usr/bin/sie-nmsgtool' -> '/usr/lib/sie-dns-sensor/nmsgtool'

the argument/environment parsing code that nmsgtool uses [0] builds an
environment variable based on the process name, but it doesn't
canonicalize away "-", so we cannot actually use "sie-nmsgtool" as the
process name for the nmsgtool binary.  (that is, in order to call the
binary "sie-nmsgtool" we'd need to export a shell variable named
"ARGV_SIE-NMSGTOOL" which is not syntactically valid.)

so put the nmsgtool binary in /usr/lib/sie-dns-sensor/ without the
'sie-' prefix.  also use "sie-dns-sensor.pid" as the pidfile name.

[0] https://256.com/sources/argv/argv.html
sie-functions: use "sie-dns-sensor.pid" for the pidfile name
scripts/nmsg_build.sh: install private nmsgtool into /usr/$lib/sie-dns-sensor
debian/sie-dns-sensor.postrm: pass "--force" to deluser

it's possible for a laggard uploader to still be running for a few
seconds after sie-dns-sensor shuts down, which can prevent the removal
of the 'sie-dns-sensor' user. (userdel has a check that prevents users
from being removed if there are any processes owned by the user that are
still running.) pass "--force" to deluser in order to override this
check.
debian/sie-dns-sensor.postrm: run userdel instead of deluser

'deluser --force' does not actually call 'userdel --force', so call
'userdel' directly.