Transactions in our code that might need to work against CockroachDB
need to be retried in the event of a retryable error. The transaction
helper functions in dbutil do that automatically. I am changing this
code to use those helpers instead.
I also fleshed out consoledb_test.go to do actual inserts and gets to
make sure things were working correctly.
Change-Id: I089bf4c776d15dc8578080e26760bd6dff4beec9
