Problem description:
mysqlhotcopy fails if a view presents in the database.

Analysis:
Before 5.5 'FLUSH TABLES <tbl_name> ... WITH READ LOCK' will able 
to get lock for all tables (i.e. base tables and view tables). 
In 5.5 onwards 'FLUSH TABLES <tbl_name> ... WITH READ LOCK' for 
'view tables' will not work, because taking flush locks on view 
tables is not valid.

Fix:
Take flush lock for 'base tables' and read lock for 'view table' 
separately.

Note: most of the patch has been backported from bug#13006947's patch