Change print statements to work in python3

This is part of a series of changes to introduce Python3 support.

Change-Id: I373be5de7141aa127d7debdbce1df39148dbec32

subcmds/version.py

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import print_function
 import sys
 from command import Command, MirrorSafeCommand
 from git_command import git
@@ -32,12 +33,12 @@ class Version(Command, MirrorSafeCommand):
     rp = self.manifest.repoProject
     rem = rp.GetRemote(rp.remote.name)
 
-    print 'repo version %s' % rp.work_git.describe(HEAD)
-    print '       (from %s)' % rem.url
+    print('repo version %s' % rp.work_git.describe(HEAD))
+    print('       (from %s)' % rem.url)
 
     if Version.wrapper_path is not None:
-      print 'repo launcher version %s' % Version.wrapper_version
-      print '       (from %s)' % Version.wrapper_path
+      print('repo launcher version %s' % Version.wrapper_version)
+      print('       (from %s)' % Version.wrapper_path)
 
-    print git.version().strip()
-    print 'Python %s' % sys.version
+    print(git.version().strip())
+    print('Python %s' % sys.version)