(PUP-1255) Don't be sensitive to pseudo-inherited ACEs

Previously, the test would fail on Windows 2012, as the access control
entries in the Temp directory's DACL are missing the INHERITED_ACE bit:

    > setacl -on  temp -ot file -actn list  -lst "f:tab;w:d,s,o,g;i:y"
    temp

    Owner: WIN-61G7FSKJ7JI\josh
    Group: WIN-61G7FSKJ7JI\None
    DACL(not_protected):
    NT AUTHORITY\SYSTEM    full   allow container_inherit+object_inherit
    BUILTIN\Administrators full   allow container_inherit+object_inherit
    WIN-61G7FSKJ7JI\josh   full   allow container_inherit+object_inherit

Note how none of the entries granting 'full' access are "inherited".

The test creates two empty temp files (the source is generated in the
call to Puppet::Util.replace_file) each with permissions:

    WIN-61G7FSKJ7JI\josh
    WIN-61G7FSKJ7JI\None
      NT AUTHORITY\SYSTEM:(I)                       0x1f01ff
      BUILTIN\Administrators:(I)                    0x1f01ff
      WIN-61G7FSKJ7JI\josh:(I)                      0x1f01ff

Each ACE is inherited and grants full access as expected. But when the Win32
API `ReplaceFile` is called, it prepends non-inherited ACEs to the destination
file:

    WIN-61G7FSKJ7JI\josh
    WIN-61G7FSKJ7JI\None
      NT AUTHORITY\SYSTEM:                          0x1f01ff
      BUILTIN\Administrators:                       0x1f01ff
      WIN-61G7FSKJ7JI\josh:                         0x1f01ff
      NT AUTHORITY\SYSTEM:(I)                       0x1f01ff
      BUILTIN\Administrators:(I)                    0x1f01ff
      WIN-61G7FSKJ7JI\josh:(I)                      0x1f01ff

While the merging behavior is unexpected, it doesn't alter the effective
security of the file.

This commit marks the directory as protected, which breaks inheritance
at that point. As a result, ReplaceFile behaves as expected.

Also note that if the Temp ACLs are reset recursively:

    icacls Temp /reset /t

Then the merging behavior does not occur and the test passes (without
this commit).

See also pseudo-inherited ACEs:
http://helgeklein.com/setacl/faq/#what-are-pseudo-protected-acls-and-pseudo-inherited-aces-setacl-2-1