PubSub, Logging, Datastore, BigQuery testing on GAE Std J7 & GAE Std J8

[lesv]

Veener libraries need to be tested (ie. deployed) to GAE Standard using Java 7 and Java 8.

@ludoch can WL you.

[lesv]

We've been told this shouldn't block GA, as gRPC on GAE 7 gVisor isn't ready yet. DevRel will take GAE 8 for Q2

[garrettjonesgoogle]

Java 7 is not going to be supported, and Java 8 has been tested, with known issues documented in #1918 . Closing the present issue.