Import from 'dgit -d ubuntu clone mariadb-10.1 bionic,-security,-updates'

mariadb-10.1 (1:10.1.38-0ubuntu0.18.04.2) bionic; urgency=medium

  * Restore tests to stop autopkgtest failures, by adding commits
    from debian git (salsa) listed below (LP: #1824335)
  * Revert "Remove the mariadb-test-* packages"
    - debian commit 96d3f8ab
  * Omit test plugins as they are not used by the tests and
    already deleted
    - debian commit 902dffe6
  * Define autopkgtest with isolation-container to allow service
    - debian commit 596c2581
  * Utilize upstream unstable-tests list in tests/upstream
    mysql-test-run
    - debian commit 33d85312
  * Fix typo in commit 33d85312 so skip list is not reset when
    adding lines
    - debian commit 18480afc
  * Mark selected tests as unstable so they don't stop the whole
    upload in vain
    - debian commit d44ece56
  * Disable test unit.pcre_test on s390x that was failing in
    stretch-security
    - debian commit d44ece56

 -- Dan Streetman <ddstreet@canonical.com>  Fri, 12 Apr 2019 12:34:00 -0400