Use default selectors

selectors module provides an abstraction to use the best select method available. Since it was introduced in Python 3.4, we could use it instead of the default select.select.

assigned to @ced

added trytond type::performance + 1 deleted label

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New review364881002 at https://codereview.tryton.org/364881002/#ps391601002

New changeset 347d108696ce by Cédric Krier in branch 'default':
Use default selectors instead of select
https://hg.tryton.org/trytond/rev/347d108696ce

added 1 deleted label and removed 1 deleted label

closed

New changeset 9b95ff2d011f by Cédric Krier in branch 'default':
Use default selectors instead of select
https://hg.tryton.org/tryton-env/rev/9b95ff2d011f