Fix print() breakage in python 2.7 environments

Fixes: #164
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

src/python/bpf/__init__.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import print_function
 import atexit
 from collections import MutableMapping
 import ctypes as ct