Silent mode for adb for health checks

[drewaogle]

when using adb in docker to check for the database being healthy it would be useful to have a mode where we can add something like --silent when we expect there to be errors

[drewaogle]

if I use adb utils execute summary to check for a db running it throws a ton of errors when the db isn't running yet. If we know it isn't running, it isn't helpful for this purpose.

[gsaluja9]

So this is for like wait till ready for clients that must have aperturedb instance up before progressing.

[bovlb]

I'd suggest that adb could support wait_until_ready directly, polling aperturedb until it responds, or until we hit a timeout (30s?).