Bug #71115 mysql_plugin testcase broken with out of source builds

Description:
mysql_plugin testcase is broken with out of source builds because it searches for the daemon_example.ini file in the build or installed server directory, while the file is present in the source or installed server directory.  Thus, if testing on source-built server with build != source, it is not found.

This happens because the testcase searches for the file by

  my $daemonexample_ini= "$ENV{DAEMONEXAMPLE_DIR}/daemon_example.ini";
  $daemonexample_ini =~ s,/plugin/debug/,/plugin/,;

Where DAEMONEXAMPLE_DIR is setup by MTR to be build (or installed server) directory.

How to repeat:
mysql-server$ mkdir obj
mysql-server$ cd obj
mysql-server/obj$ cmake ..
mysql-server/obj$ make
mysql-server/obj$ cd mysql-test
mysql-server/obj/mysql-test$ ./mysql-test-run mysql_plugin
...
main.mysql_plugin                        [ skipped ]  Test requires known location of daemon_example.ini file.

Suggested fix:
Not sure. Either copy the file to build dir during the build, either look for it in both locations in the testcase.

Hello Laurynas,

Thank you for the bug report.
Verified as described.

Thanks,
Umesh