MDEV-37527 Client plugins are underlinked

Provide test case

Author: vaintroub

mysql-test/suite/plugins/r/auth_ed25519.result

@@ -70,6 +70,8 @@ current_user()
 test1@localhost
 disconnect con1;
 connection default;
+# Executing 'mariadb-admin'
+mysqld is alive
 drop user test1@localhost;
 uninstall plugin ed25519;
 select ed25519_password("foo");

mysql-test/suite/plugins/t/auth_ed25519.test

@@ -50,6 +50,9 @@ select current_user();
 disconnect con1;
 connection default;
 
+--echo # Executing 'mariadb-admin'
+--exec $MYSQLADMIN -u test1 -S $MASTER_MYSOCK -P $MASTER_MYPORT --password=secret ping
+
 drop user test1@localhost;
 uninstall plugin ed25519;
 error ER_CANT_INITIALIZE_UDF;