Introduce new type autofs::map

[traylenator]

autofs::map allows a map entry to be added to
a pre configured map file. e.g.

autofs::mount{'/data':
  mapfile => '/etc/auto.data',
  mount   => '/data',
  mapcontents => [
    'C -rw nfs.example.org:/path/to/C',
    'C -rw nfs.example.org:/path/to/C',
  ]
}

autofs::map{'A':
  mapfile  => '/etc/auto.data',
  mapcontent => 'A -rw  nfs.example.org:/path/to/A',
}

In this case the auto.data file is now managed as a concat file.

The motivation here is to make the configuration more modular.

[traylenator]

I was thinking it may make sense to just call autofs::map for each of the elements of the mapcontents array. In adition the concat could be moved to autofs::map also wrapped in an ensure resource.
This would make #58 redundant. The problem is however I don't see a ways to set to the excutable bit in a sensible way other than leave the concat in the autofs::mount type.

[dhollinger]

Looks great! Thanks!