Problem was that ALTER TABLE DISABLE KEYS incremented create_trid for the table,
which made the new index entries invisible until the global trid catched up.

Fixed by only updating create_trid if we are rewriting all rows and indexes.


mysql-test/suite/maria/alter.result:
  Added test case
mysql-test/suite/maria/alter.test:
  Added test case
storage/maria/ha_maria.cc:
  Only updating create_trid if we are doing a full repair (and thus rewriting all rows and indexes).
storage/maria/trnman.c:
  More DBUG_PRINT