Bump the version number to 11.8.0 for release.

Bump the version number for RC.

4th RC for 11.8.0.

Bump the version number to 11.8.0.rc.3 for a new RC build.

Bump the version number for RC 11.8.0.

Release Candidate 1 for Chef 11.8.0.

Development version for Chef 11.10.0.

Release Candidate 0 for Chef 11.8.0

use pessimistic version constraint

- this is compatible with gem versions from 11.6.0 with minimal
  changes.
- mixlib-shellout differs in windows-versus-unix due to version pinning
  in windows-pr picking up old mixlib-shellout on windows, this is
  not fixed, and left similar to 11.6.0
- gem versions should be levelled up for 11.8.x and beyond
- newly built 11.6.0 will pick up new mixlib-config 2.0 which is
  a delta from the downloadable omnibus builds, 11.6.2 will not
  pick up mixlib-config 2.0

version bumping and docs for 10.28.2