Add option --prevew-archive to `knife cookbook site share`
updates by comment. #1724

- Fix Typo prevew_archive to preview_archive.
- Change message priority from warn to info.
- Add few specs.
Merge remote-tracking branch 'upstream/master' into prevew_archive_before_site_share
change option name --preview-archive to --[no-]upload
Merge remote-tracking branch 'upstream/master' into prevew_archive_before_site_share
Merge remote-tracking branch 'upstream/master' into prevew_archive_before_site_share
change option name to dry-run and set false as default.
remove line for debug
wrap specs in context
Merge pull request #1724 from higanworks/prevew_archive_before_site_share

Add option --prevew-archive to `knife cookbook site share`