Revert "Merge pull request #1901 from opscode/dont-prepend-to-relative-paths"

This reverts commit 1241ea6f9866d0e61d11129bb32e5fc96cd2bac0, reversing
changes made to 34d956c6b96087e6ca4bfbc9080037ded481709d.

Conflicts:
	spec/functional/resource/file_spec.rb
	spec/functional/resource/link_spec.rb
	spec/unit/provider/link_spec.rb
As https://github.com/opscode/chef/issues/2580 summarizes, Link resource need to support relative paths in its 'to' attribute since one can create a symlink pointing to a relative location. This is useful if the directory that symlink resides in moves to a different place (e.g. mounting a disk on a separate location).

This commit preserves relative paths inside the "encode_path" method used by the link operations and expands relative paths in similar fashion when being used by file operations.
Cleanup Mixin:ShellOut use/specs
Use extend instead of opening class and including
Renamed dummy_obj to shell_out_obj
Merge pull request #2629 from opscode/jdm/shellout-spec

Cleanup Mixin:ShellOut use/specs
Windows msi package privoder unit tests run on all on all systems
Add specs for windows msi_spec
Bug #2625: Include ShellOut mixin in msi package provider
CHANGELOG information for https://github.com/opscode/chef/issues/2580.
Merge pull request #2623 from opscode/sersut/revert-1901

Preserve relative paths in Link resource
Changed spec description
Merge pull request #2637 from opscode/jdm/issue-2626-rebase

Jdm/issue 2626 rebase
Convert knife specs to let bindings
Add specific error messaging for SSL errors to knife

Knife now gives an error message like this when an SSL error occurs:

```
ERROR: Could not establish a secure connection to the server.
Use `knife ssl check` to troubleshoot your SSL configuration.
If your Chef Server uses a self-signed certificate, you can use
`knife ssl fetch` to make knife trust the server's certificates.

Original Exception: OpenSSL::SSL::SSLError: SSL_connect returned=1
errno=0 state=SSLv3 read server certificate B: certificate verify failed
```