Customized configuration support is not used since introduction of
Caddy software, so there is no need to support it anymore.

also add CPU=native for possibly better performance.

See merge request nexedi/slapos!769

so that we can create caucase-updater for fetching CA / CRL only purpose.

To avoid

[2020-06-03 15:35:15,590] INFO     While:
[2020-06-03 15:35:15,590] INFO       Installing.
[2020-06-03 15:35:15,590] INFO       Getting section template-cloudooo.
[2020-06-03 15:35:15,590] INFO       Initializing section
template-cloudooo.
[2020-06-03 15:35:15,591] INFO       Getting section
dynamic-template-cloudooo-instance-parameter-dict.
[2020-06-03 15:35:15,591] INFO       Initializing section
dynamic-template-cloudooo-instance-parameter-dict.
[2020-06-03 15:35:15,591] INFO       Getting option
dynamic-template-cloudooo-instance-parameter-dict:gcc.
[2020-06-03 15:35:15,591] INFO     Error: Referenced option does not
exist: gcc location

On debian 8.5 cloudooo refuses to start with:

    ./parts/libreoffice-bin/program/soffice.bin: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by ../parts/mesa/lib/libGL.so.1)

some more info:

    # dpkg  -S  /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.20
    libstdc++6:amd64: /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.20

Create a Software Release for Replication Manager 2.1

https://github.com/signal18/replication-manager

See merge request nexedi/slapos!719