Improve OneProvision to not rely strictly on static files

[rsmontero]

Description

1. OpenNebula supports only 4 Equinix facilities in OneProvision: am6, ny5, sv15, ty11.
2. All configuration is kept in static files
3. Multiple facilities are available:

AMER: dc13 iad1 da11 dfw2 sv15 sv16 sjc1 sp4 ch3 ny5 ny7 ewr1 la4 tr2 se4 sea1
EMEA: am6 ams1 fr2 ld7 md2 pa4
APAC: sg1 sg4 sin3 sy4 syd2 hk2 hkg1 sl1 ty11 nrt1

The idea here is to have a way to easily add other facilities not predefined in static files.

Same applies to instance types

Use case Deal with updates in providers

Interface Changes Posible none, as we can keep static files as a fallback

Progress Status

• [ ] Code committed
• [ ] Testing - QA
• [ ] Documentation (Release notes - resolved issues, compatibility, known issues)