Various Puppet lint fixes

* Fixes following warnings:
    * double quoted string containing no variables
    * string containing only a variable
    * variable not enclosed in {}
    * indentation of => is not properly aligned
* Fix following error:
    * two-space soft tabs not used
* Remove some comments from the code, they added no value.

Change-Id: I3165e65e95c3565951077786d2edf77245460c35