Drop now unused "from __future__" imports

Signed-off-by: Niels Thykier <niels@thykier.net>

britney.py

@@ -179,8 +179,6 @@ does for the generation of the update excuses.
 
  * The excuses are written in an HTML file.
 """
-from __future__ import print_function
-
 import optparse
 import os
 import sys

britney2/hints.py

@@ -12,8 +12,6 @@
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
-from __future__ import print_function
-
 from itertools import chain
 
 from britney2.migrationitem import MigrationItem

britney2/installability/solver.py

@@ -14,8 +14,6 @@
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
-from __future__ import print_function
-
 import os
 from collections import deque