Make installation script ready for 5.1.0 and pup removal
Merge branch 'pup_source_install_script_removal' into 5.1.x
Only hide the password if there is one
Bump version to 5.1.1
Do not allow failures for mongo

Otherwise it can silent proper errors
Disable Restart Manager

Restart Manager would tell the user that the uninstallation would
require a reboot upon uninstallation.

Disabling it will fix that, and if some files are still open and need
to be closed it will tell the user which ones.
Handle the unknown flag case