For this to work, SIM cards config needs to be modified,
impu and impi must be for instance:
impu: 001010000001312,
impi: 001010000001312@ims.mnc001.mcc001.3gppnetwork.org

TODO:

    - add tests / make tests works
    - don't launch IMS if amarisoft version is too old
    - merge branch ims of slapos.package
    - modify update amarisoft script of slapos.package
      to copy libs to /opt/amarisoft/ltemme (needed for
      newest amarisoft version)