Various Puppet lint fixes

* Fix following warnings:
    * double quoted string containing no variables
    * indentation of => is not properly aligned
    * mode should be represented as a 4 digit octal value or symbolic mode
    * string containing only a variable
    * top-scope variable being used without an explicit namespace
    * unquoted file mode
    * variable not enclosed in {}
* Fix following errors:
    * trailing whitespace found
    * two-space soft tabs not used
* Remove quotes around class in include/require statements

Change-Id: Ia920d848e1955612a6486ec8731309e6d3a70f63