* PT-2150 Fix tests for pt-mysql-summary
- Added POSIX environment to tests, so they do not depend on the local user environment
- Enabled keyring plugin on 8.0
- Fixed encryption information collection in 8.0, see also PT-1588
* PT-2150 Fix tests for pt-mysql-summary
- Added support of the environment variable DISABLE_KEYRING, so we can diable keyring plugin in sandbox/servers/start
* PT-2150 Fix tests for pt-mysql-summary
- Reverted changes in the expected output for tests 006 and 007 made by commit 9190b5e6ac
Because the tool now works properly again and can parse Percona XtraDB Cluster data
* PT-2150 Fix tests for pt-mysql-summary
- Added comment '--read-samples' back to the test cases
In order to be able to test encryption support in Percona Server and
MySQL, we need to enable encription plugins in the sandbox.
This commit adds detection of plugin libraries in the MySQL binaries
directory and enables it automatically.