Re-branding Sovrin StagingNet to TestNet

[KoleBarnes]

Signed-off-by: Kole Barnes [email protected]

[KoleBarnes]

@Patrik-Stas, some of these changes include changes to the elastic search index's. Is that advisable, or will it cause problems?

[Patrik-Stas]

hi @KoleBarnes, yes the changes to indices would cause some trouble when deploying. If you are willing to still get back to this, I'd suggest approach where we only make additions to code, no changes.
Eg we will add new network "testnet" which will esentially share same configuration as current "stagingnet". That way I could deploy this and rescan the network from scratch, after that is complete simply add "SOVRIN_STAGINGNET" as alias to keep indyscan.io URLs backward compatible.
And once that is done, we can delete notion of "stagingnet" (apart as an alias for "testnet").

Kind of blue/green deployment approach.