[issue36307] Upgrade Travis CI config to Xenial from near-EoL Trusty and remove obsolete sudo: false key

[C.A.M. Gerlach]

C.A.M. Gerlach <CAM.Gerlach at Gerlach.CAM> added the comment:

Yes, absolutely.

While were at it, should we also bump the OpenSSL version up to the latest 1.1.1b, which is the current LTS branch (with 1.0.2 EoL in Dec. 2019 and 1.1.0 EoL in a few months, in September)?

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components: +Build

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<https://bugs.python.org/issue36307>
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