Broken link to CLA on contribution docs

[pfaion]

Hi everyone,

the link to the CLA for contributing is broken:

cli/CONTRIBUTING.md

Line 11 in 06e5e0d

4. Sign the [CLA](http://www.oracle.com/technetwork/community/oca-486395.html)

Try here: http://www.oracle.com/technetwork/community/oca-486395.html