opened
ejona86
username_0
Since openjdk8 is dead to us (see #19113), we cannot leave openjdk8 in
the list of runtimes in client_matrix.py. The list of runtimes is now
the defaults to use, which includes master, and you can specify
alternative runtimes per-release.

Fixes #19113

------

I've tested this change with:
```
$ tools/interop_matrix/create_matrix_images.py --language java
$ docker_image=gcr.io/grpc-testing/grpc_interop_java:master tools/interop_matrix/testcases/java__master
```
Swap java interop tests to openjdk8
issue
created
jtattermusch
username_1
I've started an adhoc run of interop matrix.
comment
created
jtattermusch
username_1
Known failures:
#18967
#18608
#18416
comment