aaa.processes.run shouldn't assume 0 is the only "good" exit code

[heini]

Some programs out there return different exit codes to indicate success, so it would be better to allow passing in an array of "good" exit codes, with [0]being the default.

An example for such a program is the Puppet agent, which returns 0 in case it didn't need to perform any actions and 2 if it did but w/o errors.

[mosteo]

Indeed. We are already doing this in the version in Alire.