MDEV-25998 encryption.innodb_encryption_filekeys failure in buildbot

  - Set the innodb_encrypt_tables variable before
timeout happens. It will add the pending tablespace
to default encrypt list and does the encryption/decryption
based on innodb_encrypt_tables.

mysql-test/suite/encryption/t/innodb_encryption_filekeys.test

@@ -48,6 +48,12 @@ while ($cnt)
     {
         real_sleep 1;
         dec $cnt;
+        if ($cnt == 200)
+	{
+	  --disable_query_log
+	  set global innodb_encrypt_tables = on;
+	  --enable_query_log
+	}
     }
 }
 if (!$success)
@@ -78,6 +84,12 @@ while ($cnt)
     {
         real_sleep 1;
         dec $cnt;
+        if ($cnt == 200)
+	{
+	  --disable_query_log
+	  set global innodb_encrypt_tables = off;
+	  --enable_query_log
+	}
     }
 }
 if (!$success)
@@ -107,6 +119,12 @@ while ($cnt)
     {
         real_sleep 1;
         dec $cnt;
+        if ($cnt == 200)
+	{
+	  --disable_query_log
+	  set global innodb_encrypt_tables=on;
+	  --enable_query_log
+	}
     }
 }
 if (!$success)