scripts: python3: get rid of __future__ imports

Removed print_function and with_statement imports from __future__
as they're supported by python 3 by default.

(From OE-Core rev: 77ae2daad5d775d710b953cf0c623ce74cb2c274)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/bitbake-whatchanged

@@ -17,7 +17,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
-from __future__ import print_function
 import os
 import sys
 import getopt

scripts/pybootchartgui/pybootchartgui/main.py.in

@@ -16,8 +16,6 @@
 #  You should have received a copy of the GNU General Public License
 #  along with pybootchartgui. If not, see <http://www.gnu.org/licenses/>.
 
-from __future__ import print_function
-
 import sys
 import os
 import optparse

scripts/pybootchartgui/pybootchartgui/parsing.py

@@ -13,9 +13,6 @@
 #  You should have received a copy of the GNU General Public License
 #  along with pybootchartgui. If not, see <http://www.gnu.org/licenses/>.
 
-
-from __future__ import with_statement
-
 import os
 import string
 import re

scripts/wic

@@ -28,8 +28,6 @@
 # AUTHORS
 # Tom Zanussi <tom.zanussi (at] linux.intel.com>
 #
-from __future__ import print_function
-
 __version__ = "0.2.0"
 
 # Python Standard Library modules