Added support for legacy options in the module

[tuxfight3r]

The documentation needs to be updated pending your approval. I've tested it with the below data. If you have any suggestions for improvement, I'm happy to implement it. thanks.

This time I will do the documentation as a separate pull request :)

rsyslog::client::legacy_config:
  auth_priv_rule:
    key: "auth,authpriv.*"
    value: "/var/log/auth.log"
  auth_none_rule:
    key: "*.*;auth,authpriv.none"
    value: "/var/log/syslog"
  syslog_all_rule:
    key: "syslog.*"
    value: "/var/log/rsyslog.log"
  kernel_all_rule:
    key: "kern.*"
    value: "/var/log/kern.log"
  mail_all_rule:
    key: "mail.*"
    value: "/var/log/mail.log"
  mail_error_rule:
    key: "mail.err"
    value: "/var/log/mail.err"
  news_critical_rule:
    key: "news.crit"
    value: "/var/log/news/news.crit"
  news_error_rule:
    key: "news.err"
    value: "/var/log/news/news.err"
  news_notice_rule:
    key: "news.notice"
    value: "/var/log/news/news.notice"
  emergency_rule:
    key: "*.emerg"
    value: ":omusrmsg:*"
  testing_legacy_rule:
    value: "*.* >dbhost,dbname,dbuser,dbpassword;dbtemplate"
    type: "legacy"
  testing_legacy_remote_logserver:
    value: "*.* @@logmonster.cloudfront.net:1514"
    type: "legacy"