Package manager discovery order

See the release notes for the list of interesting changes.

• Refresh Beaker API client in mrack to use up-to-date Kerberos ticket by @happz in #2775
• Correctly show the --provision-timeout default by @psss in #2817
• Remove the .travis.yml config file by @LecrisUT in #2811
• Clarify the --last symlink creation race a bit by @psss in #2818
• Removing c9s workaround for pytest-container by @martinhoyer in #2836
• Update pre-commit checks and add a couple of new ones by @happz in #2835
• Add unit test for package manager installing a file system path by @happz in #2830
• Refactor package manager discovery to allow priorities by @happz in #2861
• Removing /var/tmp workdir from rpm packaging by @martinhoyer in #2876

Full Changelog: 1.32.1...1.32.2