Added oqgraph "create attr" test as per Andrew's regression test. Fixups required before we can record results.

Updated oqgraph copyright, version and author info.

Make sure that boost is included with consistent config.

MDEV-3997: Querying a Cassandra table on a server with query cache enabled is likely to cause problems
- Disable query cache for Cassandra tables.

my_alloca() cannot have MY_THREAD_SPECIFIC, because can be used
outside of the THD context.

when no ha_example.so is built

Add a wait for binlog checkpoint to avoid thread scheduling
giving different binlog order at random.

When CHANGE MASTER fails, it may or may not have already added
the Master_info * to the index. Implement logic that properly
handles removal and freeing in both cases.

to storage/cassandra/CMakeLists.txt

storage/cassandra/CMakeLists.txt:
  more thourough CHECK_CXX_SOURCE_COMPILES test, that checks whether
  boost::shared_ptr can work with --fno-rtti
  
  don't install anything in INSTALL_SYSCONFDIR, if the latter is unset