Create a service-connectivity-pre-jarjar library

This is needed for FrameworksNetTests because it inculdes
service-connectivity. Without this library, the service-connectivity
is already jarjar-ed which will cause the util classes couldn't be
found when running the tests. So let the tests inculde the pre-jarjar
version and service-connectivity applies the jarjar to this library.

Bug: 177046265
Test: FrameworksNetTests
Change-Id: I1acd95ff9bec99b918646e8ec3a57f3ef156e2ca
Merged-In: I1acd95ff9bec99b918646e8ec3a57f3ef156e2ca