Fix deploy_logs unicode handling for Python 2 & 3

Fix deploy_logs unicode handling for Python 2 & 3

six.text_type will always return a utf-8 encoded string, while
str.encode will return a bytes object in Python 3. io.open is
used to ensure that the file is being opened for utf-8 writing in
Python 2. decode('utf-8') is used on the requests response due to
how requests encodes unicode responses.

Change-Id: If58f8a3b9617f0be4effc58414d22f0cf09946cb
Signed-off-by: Eric Ball <eball@linuxfoundation.org>