ja: fix a few typos

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
ja: fix the topology configuration scripts

When quitting mininet using the script(link_aggregation.py,
spanning_tree.py), the following error messages occur
and cannot clean up the topology configuration.

  mininet> exit
  Traceback (most recent call last):
    File "spanning_tree.py", line 47, in <module>
      net.stop()
    File "build/bdist.linux-x86_64/egg/mininet/net.py", line 409, in stop
    File "build/bdist.linux-x86_64/egg/mininet/net.py", line 382, in stopXterms
  AttributeError: 'list' object has no attribute 'pid'

This patch fixes these scripts.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: fix a few typos

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
en: fix the topology configuration scripts

When quitting mininet using the script(link_aggregation.py,
spanning_tree.py), the following error messages occur
and cannot clean up the topology configuration.

  mininet> exit
  Traceback (most recent call last):
    File "spanning_tree.py", line 47, in <module>
      net.stop()
    File "build/bdist.linux-x86_64/egg/mininet/net.py", line 409, in stop
    File "build/bdist.linux-x86_64/egg/mininet/net.py", line 382, in stopXterms
  AttributeError: 'list' object has no attribute 'pid'

This patch fixes these scripts.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>