refs #9470 - set :limit on column, fix MailNotification initializer

MailNotification.new failed unless it had a Hash argument, hence the
factory had been changed from default behaviour. It also then ignored
all attributes except a given few listed in initialize_with.

Fixes #9470 - Adds an option to send puppet error emails for all host to a user

Adds an option to the puppet error state notification - Subscribe to all hosts, when error occurs from any authorize host, the user will get an email