CAIDA's IXP info and membership

[romain-fontugne]

This adds CAIDA IXP information and IXP membership. It may adds some redundant links with PeeringDB but as it also adds new IXPs (found via HE) I wanted to make sure the links are consistent across all IXP.

How Has This Been Tested?

Tried locally, the data seems properly imported to me.

Types of changes

• 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 change)

Checklist:

• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[m-appel]

I've added some comment :)
We should also update the README since there are dependencies. The ix_asns crawler depends on ixs, and ixs depends on the PeeringDB crawlers.

[romain-fontugne]

Thanks for the comments. I have completely forgot about the README! 😨

[m-appel]

Thanks, looks good to me now.