travis: Update .travis.yml

For scenario_test, Python build environment is more suitable rather than
Go build environment, because scenario_test is written in Python and the
building source codes will be done on Docker containers.

This patch fixes scenario_test to use Python build environment and
reduces "sudo" executions in order to use interpreter of virtualenv.

Note: On Travis-Ci, the Python interpreter of sudoer is older version,
and when install packages with "sudo pip", InsecurePlatformWarning will
be displayed. So it is better to use the newer interpreter of virtualenv.

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

0 files changed, 0 insertions, 0 deletions