MariaRocks: trying to get the MTR tests to work

- Add include/have_rocksdb.inc (TODO: is there any way to have this
  file somewhere under storage/rocksdb/mysql-test ?)
- Make rocksdb.test require have_partition.inc because it uses
  partitioned tables

mysql-test/include/have_rocksdb.inc

+if (`SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.ENGINES WHERE engine = 'rocksdb' AND support IN ('DEFAULT')`)
+{
+  --skip Test requires default engine RocksDB
+}
+
+# MARIAROCKS_NOT_YET: replication doesn't work yet:
+#if (`select count(*) = 0 from information_schema.tables where engine='rocksdb' and table_name='slave_gtid_info'`)
+#{
+#  --skip Test requires default engine RocksDB
+#}
+
+--disable_query_log
+# Table statistics can vary depending on when the memtables are flushed, so
+# flush them at the beginning of the test to ensure the test runs consistently.
+set global rocksdb_force_flush_memtable_now = true;
+--enable_query_log
+

storage/rocksdb/mysql-test/rocksdb/t/rocksdb.test

 --source include/have_rocksdb.inc
+--source include/have_partition.inc
 
 #
 # RocksDB Storage Engine tests