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.