[SlapOS Product][slapos_slap_tool] Don't use super keyword.
Add support for getSoftwareReleaseListFromSoftwareProduct() SLAP method.
[VIFIB product] Extend getSoftwareReleaseListFromSoftwareProduct to accept software_release_url.

Accept a software_release_url parameter as related document.
[SlapOS Core] Add support for Software Product in request, supply and console.
[SlapOS Core] Add tests for everything related to Software Product support.
[SlapOS Core] Implement support of getSoftwareReleaseListFromSoftwareProduct in proxy.

WARNING: Also remove alias support from slapos client.
[SlapOS Core] Add configure-local command for standalone slapos.
[SlapOS Core] Improve configure-local command and add test for this command