Add the possiblity to restrict the json query when creating the VOMS files

[Pansanel]

Summary

When using this module on a site, it takes a long time to go through all the VOs. This pull request permits to restrict the VOMS file generation to the VOs supported by the site. For doing this, the site admin should only set the supported_vos variable. ie.:

supported_vo:
  - biomed
  - dteam
  - ops

If the supported_vos is not set, then all the VOMS files are created (the default behaviour of this module is not modified).

Fix #25

[gwarf]

Thanks a lot @Pansanel, it's something that was really missing and that will help a lot!
We will look in testing this ASAP, but with the EGI Conference coming, it may take some time.

[Pansanel]

Hi,
Any news @gwarf ?

[enolfc]

LGTM. It would be good to have tests though

[enolfc]

@Pansanel do you need this to be merged soon? I can do it, but would prefer to have @gwarf approving as well

[Pansanel]

@enolfc : there is no urgency. It's mainly so that this PR is being reviewed.

[gwarf]

I was willing to test this furthermore, but I lacked time, and it seems that the molecule stuff would need some refresher to work properly with the last version of molecule.
Let's merge, I will also try to test this in the context of using an AlmaLinux 9 with UDM 5 repositories.
Sorry for the delay @Pansanel :/

[gwarf]

From my quick tests it works great and saves a lot of time, thanks a lot @Pansanel!