Massimiliano Culpo 11fa61665f travis: use bionic as default for Linux (#16521) ... Modifications: - [x] Travis now uses `bionic` as a default (`xenial` used for Python 3.5, `trusty` for Python 2.6) - [x] Shell unit tests have been factored into their own run - [x] `kcov` is built only for tests that upload coverage results Overall with this we shave 3-4 mins. on each run and add an additional run of about 3 min. For some reason `kcov` 38 fails forwarding output when used with Python unit tests, so I used v34 for that and v38 (latest) for shell testing. Previously we were using v25.		2020-05-12 13:56:01 -07:00
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spack	travis: use bionic as default for Linux (#16521)	2020-05-12 13:56:01 -07:00