MODULES-3699 Deprecation spec fix 2

[eputnam]

1. The manifest containing the deprecation function needed to be modified (surrounded in double quotes) to work as a puppet apply command on windows.
2. "exist" was not working on Solaris 10 because the underlying command doesn't actually exist on Solaris 10, so I changed it to "be_file" which works just fine for this.
3. Added conditional logic to accommodate Windows paths.

[bmjen]

can you make this look like this instead:

add_file_manifest = <<-EOS
  deprecation('key', 'message')
  file { '#{test_file}': 
    ensure => present,
    content => 'test', 
  }
EOS

It's just easier to read and maintain.

Same with remove_file_manifest.

[eputnam]

It'd be totally easier to read and maintain that way, but since it's run on the command line (puppet apply -e style) instead of with apply_manifest, Windows seems to need it formatted this way.