aexpect is not compatible with python2

[xiaodwan]

This cause travis CI failure or warning in python2.7.

Some features (e.g. v2v) depend on latest aexpect, if aexpect is less than 1.6.1, the pylink may reports errors like,

$ inspekt checkall --disable-lint W,R,C,E1002,E1101,E1103,E1120,F0401,I0011,E1003,W605 --disable-style W605,W606,E501,E265,W601,E402,E722,E741 --exclude avocado-libs,scripts/github --no-license-check

PEP8 disabled: W605,W606,E501,E265,W601,E402,E722,E741

Pylint disabled: W,R,C,E1002,E1101,E1103,E1120,F0401,I0011,E1003,W605

Pylint enabled : W0611

License check: disabled

************* Module avocado-vt.virttest.remote

E1123:132,11: wait_for_ssh_login_to_migrate: Unexpected keyword argument 'preferred_authenticaton' in function call

If bump to latest 1.6.1, the travis ci will report SyntaxError, like,
avocado-framework/avocado-vt#2811 (comment)

so it's better to fix aexpect to compatible with python2.

[xiaodwan]

This may be not a good idea.
when avocado-vt drops python2?

[pevogam]

Can a fix like the one in avocado-framework/avocado-vt#2821 help here?

[pevogam]

This may be not a good idea.
when avocado-vt drops python2?

Also, this issue is best posted on the Avocado VT side as the newest aexpect has already dropped python 2 support.

[xiaodwan]

Can a fix like the one in avocado-framework/avocado-vt#2821 help here?

This doesn't work. In travis ci it uses aexpect 1.6.0, my fix needs aexpect >=1.6.1. but aexpect >=1.6.1 doesn't support python2.

[pevogam]

Can a fix like the one in avocado-framework/avocado-vt#2821 help here?

This doesn't work. In travis ci it uses aexpect 1.6.0, my fix needs aexpect >=1.6.1. but aexpect >=1.6.1 doesn't support python2.

I think aexpect 1.6.0 also doesn't support python2 but perhaps you just didn't encounter a specific error (e.g. the remote door utility for sure doesn't and as such we consider the entire project as not supporting it).

So whether we like it or not, your fixes can only affect python 3 now and the best we can do is localize the problem to the VT side and in particular the python 2 CI there.