Revert "Merge pull request #427 from percona/PT-1747"

This reverts commit 25b637d4bd, reversing
changes made to 38c169031e.

t/pt-online-schema-change/rename_fk_constraints.t

@@ -23,6 +23,10 @@ my $master_dbh = $sb->get_dbh_for('master');
 
 my $vp = VersionParser->new($master_dbh);
 
+if ($vp->cmp('8.0.14') > -1 && $vp->flavor() !~ m/maria/i) {
+   plan skip_all => 'Cannot run this test under the current MySQL version';
+}
+
 if ( !$master_dbh ) {
    plan skip_all => 'Cannot connect to sandbox master';
 }