The cli-based installer does not exit with a non-zero exit code when error occurs

[TheWitness]

Describe the bug

When errors occur in the install_cacti.php script, the script should exit with a non-zero exit code, which it does not.

To Reproduce

Steps to reproduce the behavior:

1. Go to /var/www/html/cacti/cli

2. uninstall a critical php module such as ldap

3. Run the installer to install cacti. Not that there are errors

4. Run "echo $?" and note that the scripted exited with a zero error code

Expected behavior

CLI script should exit with non-zero exit codes when they fail.

[netniV]

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