Deprecate and remove default_ecosystem in service options

[tmarkovski]

This no longer provides any value. When the authToken is set in the configuration, changing default_ecosystem has no effect. It's only used during login, when the ecosystem field is not provided. It seems we can completely remove this from the SdkOptions and rely on defaults in the server, if this is omitted.

[geel9]

@fundthmcalculus and I had a discussion about this the other day -- I'm in complete agreement.

[janpieterz]

GA candidate? @fundthmcalculus is it feasible this sprint?

[fundthmcalculus]

GA candidate? @fundthmcalculus is it feasible this sprint?

Totally. This is basically a quick proto change, everything from there on is essentially automated.

[geel9]

It's a sample / SDK change as well, but not bad to do.

[janpieterz]

Awesome, moved to in progress for this sprint then.

[fundthmcalculus]

@sethjback @tmarkovski is it fair to assume that if we don't send an ecosystem on login, the server automatically signs into the default ecosystem?