docker: Add bzip2 and hostname to fedora image

It is used by qemu-iotests.
Signed-off-by: NFam Zheng <famz@redhat.com>
Message-Id: <20170505032340.26467-3-famz@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NFam Zheng <famz@redhat.com>

tests/docker/dockerfiles/fedora.docker

 FROM fedora:latest
 ENV PACKAGES \
-    ccache git tar PyYAML sparse flex bison python2 \
+    ccache git tar PyYAML sparse flex bison python2 bzip2 hostname \
     glib2-devel pixman-devel zlib-devel SDL-devel libfdt-devel \
     gcc gcc-c++ clang make perl which bc findutils \
     mingw32-pixman mingw32-glib2 mingw32-gmp mingw32-SDL mingw32-pkg-config \