etherpad - tabbing, quoting & aligning

fix usual puppet-lint stuff like:

- unquoted resource titles
- aligned arrows
- double-quotes where there are no variables
- $realm should be top-scope $::realm

..

Yeah, i know we're probably dropping etherpad-old,
but i just did the whole file..

Change-Id: Iac87c642d4b421a51edabdbc2ae6981cebb0cb28
Merge "etherpad - tabbing, quoting & aligning" into production