net/mininet remove MODPY_DEFAULT_VERSION_2

[Ayaka Koshibe]

Hi,

Removing MODPY_DEFAULT_VERSION_2 since that seems to be preferred at this
point in time.

OK?

Thanks,
Ayaka

Index: Makefile
===================================================================
RCS file: /cvs/ports/net/mininet/Makefile,v
retrieving revision 1.10
diff -u -p -u -r1.10 Makefile
--- Makefile    6 Sep 2018 14:12:04 -0000       1.10
+++ Makefile    7 Sep 2018 08:02:05 -0000
@@ -21,8 +21,6 @@ MASTER_SITES =        https://github.com/akoshi
 
 MODULES =              lang/python
 MODPY_SETUPTOOLS =     Yes
-# Does not run with Python 3
-MODPY_VERSION =                ${MODPY_DEFAULT_VERSION_2}
 BUILD_DEPENDS =                devel/help2man
 RUN_DEPENDS =          net/socat \
                        net/iperf