("-") IN DATABASE NAMES IN ALTER DATABASE.

mysqldump did not quote database name in 'ALTER DATABASE'
statements in its output. This can further cause a failure
while loading if database name contains a hyphen '-'.

This happened as, while printing the 'ALTER DATABASE'
statements, the database name was not quoted.

Fixed by quoting the database name.


client/mysqldump.c:
  Bug#11766310 : 59398: MYSQLDUMP 5.1 CAN'T HANDLE A DASH
                 ("-") IN DATABASE NAMES IN ALTER DATABASE.
  
  Modified the print statement in order to print the quoted
  database name for 'ALTER DATABASE' statements.
mysql-test/r/mysqldump.result:
  Added a test case for bug#11766310.
mysql-test/t/mysqldump.test:
  Added a test case for bug#11766310.