* Substitute global.rbac.psp.enabled and global.psp.enabled uses for global.cattle.psp.enabled.
* Remove previous usages of the capabilities check to determine if PSPs and PSP-related resources are applied.
* Add a new validation file (validate-psp-install.yaml) to make the capabilities check when PSP installation is requested and issue a user-friendly message if unable to install PSP.
* Update app-readme.md to include details of this change.
* Bump chart version to 102.0.0.
* Change default value for PSP installation from true to false.
```bash
git fetch upstream
git checkout upstream/dev-v2.6-source -- packages; git reset HEAD; git checkout -- packages/README.md
```
This overwrites the previous changes based on stuff currently in dev-v2.6-source today.
(partially cherry picked from commit 1107be9199)
Mauren Berti
Steven Crespo
Jacob Payne
Arvind Iyengar