Fix a number of issues that were preventing row-copying ALTER TABLE
from working:

- ha_xpand::create() and ha_xpand::open() should take the table name
  from the arguments, not from TABLE_SHARE object.

- ha_xpand::rename_table() should not use decode_file_path() as that
  fails with an error for temporary table names (#sql_nnnn)

- Maintenance of clustrix_table_oid through TABLE_SHARE::tabledef_version
  didn't cover the temporary work tables created by ALTER TABLE code.
  Switch to storing it in the Xpand_share instead, and update it in
  ::create() and ::open.

- On as-needed-basis, add quoting of table names to pieces of code that
  build SQL statements to be ran on the backend. This is a stop-gap
  measure until a real solution is implemented.