Disable spec tests for unsupported functionality on Windows

Ruby does not support creating symlinks on Windows (though Windows does
support them), and since the tidy spec test is designed to reproduce a
specific bug (as opposed to testing symlink functionality on Windows) it
has been disabled.

Ruby on Windows also does not support File.chmod, so the inspect spec
test has been disabled. The general issue of File.chmod on Windows is
something I know needs to be investigated.

Also disabled the cron spec test as this functionality will not be
supported on Windows (instead there will be task manager support).

Re-enable the autoload spec tests as those now pass on Windows (this is
probably due to the cacher changes recently made).

The inventory ssl spec is not supported on Windows and so is disabled.
However, while researching the failure, it was due to
Time.now.strftime("%Z") returning "Pacific Daylight Time" on Windows,
instead of "PDT" like it does on other platforms. As a result, the split
method was sometimes splitting in the wrong place.

As far as I can tell, the inventory code is only called from the CA (to
keep track of serial numbers for certs that it has issued). But it's
something to watch out for on Windows when calling strftime.

Webrick, fileserver and CA functionality are not supported on Windows so
these spec tests are disabled.

Also fix path issue with catalog spec.

Also several spec tests were creating tempfiles manually and calling
system("rm -rf ..."), these have been replaced with
PuppetSpec::Files.tmpdir.

Reviewed-by: Jacob Helwig <jacob@puppetlabs.com>