handling of my.cnf config file is now optional

This adds a parameter (default value is like old behavior) so that the
my.cnf file isn't managed (created/updated) by the mysql module at all
which is necessary for our environment. We need to set all parameters by
ourself. If we don't set a parameter then the default from the mysqld
binary should be used instead of any default parameter the mysql module
provides us.
handling of my.cnf config file is now optional

This adds a parameter (default value is like old behavior) so that the
my.cnf file isn't managed (created/updated) by the mysql module at all
which is necessary for our environment. We need to set all parameters by
ourself. If we don't set a parameter then the default from the mysqld
binary should be used instead of any default parameter the mysql module
provides us.
Merge remote-tracking branch 'savar/manage_config_file_parameter'

Conflicts:
	manifests/config.pp