[COOK-3056] Allowing custom prefix for sudoers and sudoers.d

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Update CHANGELOG format
Fix README format
Version bump to v2.2.0
Bump devodd release
Merge branch 'upstream' into jenkins-upstream-14
Merge pull request #3 from rackspace-cookbooks/jenkins-upstream-14

merges from sudo - upstream