* Add homebrew installation and validation scripts
* Update `/etc/environment` in `updatepath.sh` script
Keep this code for sake of compatibility with the existing installation logic. It will be changed in its own PR
* Remove env. variables from homebrew validation task
* Move reboot to the dedicated script and task
Co-authored-by: Sergey Dolin <v-sedoli@micorosoft.com>
* Add MongoDB 4.2 to linux images
* use the same installation script for all versions
* Add helpers to get Ubuntu version
* Improve helper functions
* Rename install.sh to os.sh
Co-authored-by: Sergey Dolin <v-sedoli@micorosoft.com>