Remove zfs from static builds

The libzfs-dev package is not needed for the static builds,
and only used for ubuntu packages, so removing from
the Dockerfile.

This resolves an issue where build fails due to the PPA
having changed.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -29,11 +29,6 @@ FROM debian:jessie
 ARG APT_MIRROR=deb.debian.org
 RUN sed -ri "s/(httpredir|deb).debian.org/$APT_MIRROR/g" /etc/apt/sources.list
 
-# Add zfs ppa
-COPY keys/launchpad-ppa-zfs.asc /go/src/github.com/docker/docker/keys/
-RUN apt-key add /go/src/github.com/docker/docker/keys/launchpad-ppa-zfs.asc
-RUN echo deb http://ppa.launchpad.net/zfs-native/stable/ubuntu trusty main > /etc/apt/sources.list.d/zfs.list
-
 # Packaged dependencies
 RUN apt-get update && apt-get install -y \
 	apparmor \
@@ -63,7 +58,6 @@ RUN apt-get update && apt-get install -y \
 	libprotobuf-dev \
 	libsystemd-journal-dev \
 	libtool \
-	libzfs-dev \
 	mercurial \
 	net-tools \
 	pkg-config \
@@ -74,7 +68,6 @@ RUN apt-get update && apt-get install -y \
 	python-pip \
 	python-websocket \
 	tar \
-	ubuntu-zfs \
 	vim \
 	vim-common \
 	xfsprogs \