Support ulimits in systemd config

[ccheline]

Pull Request Template

Description

systemd ignores /etc/security/limits. This update adds the limits to the systemd configuration template so that they are applied to the running service.

Fixes # (issue)
#34

Type of change

Please delete options that are not relevant.

• [ X ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Reviews

Please identify developer to review this change

• @developer

Checklist:

• [ X ] I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• [ X ] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass with my changes