The columns in I_S tables where we display identifiers are:

innodb_buffer_page
  table_name
  index_name
innodb_buffer_page_lru
  table_name
  index_name
innodb_cmp_per_index
  database_name
  table_name
  index_name
innodb_cmp_per_index_reset
  database_name
  table_name
  index_name
innodb_locks
  lock_table
  lock_index

The only table that need not be addressed is innodb_locks - where
identifiers are correctly decoded. All other tables were implemented after
innodb_locks and should have imitated the same behavior.

In innodb_buffer_page and innodb_buffer_page_lru we have a single
column (called table_name) where we print the database and the table name,
concatenated by ".". This is the same as in innodb_locks and should follow
the same convention for decoding.

In innodb_cmp_per_index and innodb_cmp_per_index_reset we have separate
columns for database name and table name, thus we do not concatenate with
a dot and do not quote.

innodb_sys* I_S tables would better be left as they are, since they are
supposed to display the contents of InnoDB's SYS_* tables verbatim.

Approved by:	Jimmy (rb:1569)