Add defaults to enable/disable connectivity/tethering next

The defaults can be used to enable/disable connectivity next targets
depending on the branch, while minimizing merge conflicts.

The "next" target may use unstable APIs. It need to be disabled in the
branch which only have the last stable SDK available.

Also correct TetheringTestsLatestSdkLib which should use stable API.

Test: TH
Change-Id: I00d91bbd513277c1cedf67d18ac9f56cc4037309
4 files changed