fix typo on bind-address in config_file
migrate key_buffer (deprecated) to key_buffer_size in config_file
Merge pull request #395 from doc75/fixes_my_cnf

my.cnf: typo fix (bind-address) + migrate key_buffer (deprecated) to key_buffer_size
changed log_error to log-error and pid_file to pid-file to match the mysqld service script