Run test_valid_docs in batches
Run test_valid_docs in batches

This test fails often due to being trimmed, thanks to
salt.utils.dicttrim trimming values > max_event_size.

This commit changes this test so that it runs sys.doc twice, ensuring
that the return from sys.doc (for now) is not trimmed.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt