LP:609813 - mtr skips tests from --suite=innodb_plugin for lp:maria/5.2

All of the tests in suite/innodb_plugin are skipped. I assume that the problem is:
– source include/have_innodb_plugin.inc

The contents of that are:
disable_query_log;
--require r/true.require
SELECT (plugin_library LIKE 'ha_innodb_plugin%') AS `TRUE` FROM information_schema.plugins WHERE LOWER(plugin_name) = 'innodb' AND LOWER(plugin_status) = 'active';
enable_query_log;

./mysql-test-run.pl -mtr-port-base=13300 --force -suite=innodb_plugin --mysqld=-plugin-load=ha_xtradb.so
Logging: ./mysql-test-run.pl -mtr-port-base=13300 --force -suite=innodb_plugin --mysqld=-plugin-load=ha_xtradb.so
...
cmd: /s/bld/52mariabzr/sql/mysqld --no-defaults --datadir=/s/bld/52mariabzr/mysql-test/var/tmp --basedir=/s/bld/52mariabzr --language=/s/bld/52mariabzr/sql/share/english --skip-grant-tables --plugin-dir=/s/bld/52mariabzr/mysql-test/var/plugins --plugin-load=ha_xtradb.so --verbose --help
...
==============================================================================

TEST RESULT TIME (ms)
------------------------------------------------------------

worker[1] Using MTR_BUILD_THREAD 330, with reserved ports 13300..13309
innodb_plugin.innodb [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug39438 [ skipped ] Test requires: 'true'

innodb_plugin.innodb-use-sys-malloc [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug42101-nonzero [ skipped ] Test requires: 'true'
innodb_plugin.innodb-consistent [ skipped ] Test requires: 'true'
innodb_plugin.innodb-semi-consistent [ skipped ] Test requires: 'true'
innodb_plugin.innodb-analyze [ skipped ] Test requires: 'true'
innodb_plugin.innodb-autoinc [ skipped ] Test requires: 'true'
innodb_plugin.innodb-autoinc-44030 [ skipped ] Test requires: 'true'
innodb_plugin.innodb-index [ skipped ] Test requires: 'true'
innodb_plugin.innodb-index_ucs2 [ skipped ] Test requires: 'true'
innodb_plugin.innodb-lock [ skipped ] Test requires: 'true'
innodb_plugin.innodb-replace [ skipped ] Test requires: 'true'
innodb_plugin.innodb-timeout [ skipped ] Test requires: 'true'
innodb_plugin.innodb-zip [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug21704 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug34053 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug34300 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug35220 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug36169 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug36172 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug38231 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug40360 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug40565 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug41904 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug42101 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug44032 [ skipped ] Test requires: 'true'
innodb_plugin.innodb_bug44369 [ skipped ] Test requires: 'true'

In contrast, the results for --suite=innodb are better:

worker[1] Using MTR_BUILD_THREAD 330, with reserved ports 13300..13309
innodb.innodb_bug51920 [ disabled ] Waiting for merge with XtraDB
innodb.innodb_bug52663 [ disabled ] Waiting for merge with XtraDB
innodb.innodb_misc1 [ pass ] 5965
innodb.innodb_bug39438 [ pass ] 30
innodb.innodb-semi-consistent [ pass ] 12822
innodb.innodb_bug42101-nonzero [ pass ] 3
innodb.innodb-autoinc [ pass ] 22406
innodb.innodb-autoinc-44030 [ pass ] 10671
innodb.innodb-lock [ pass ] 4142
innodb.innodb-replace [ pass ] 14
innodb.innodb-use-sys-malloc [ pass ] 34
innodb.innodb_bug21704 [ pass ] 177
innodb.innodb_bug34053 [ pass ] 78
innodb.innodb_bug35220 [ pass ] 18
innodb.innodb_bug38231 [ pass ] 26
innodb.innodb_bug40565 [ pass ] 34
innodb.innodb_bug42101 [ pass ] 3
innodb.innodb_bug44369 [ pass ] 3
innodb.innodb_bug45357 [ pass ] 35
innodb.innodb_bug46000 [ pass ] 37
innodb.innodb_bug47621 [ pass ] 40
innodb.innodb_bug47777 [ pass ] 138
innodb.innodb_trx_weight [ pass ] 620