RFR(S): 8226796: Reduce debug level logging for oopstorage+blocks

[Kim Barrett]

> On Jul 26, 2019, at 6:06 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
>  looks good. Note that I did not check whether the log level changes
> make sense as I have no good grasp of what is important and what not in
> this area, but the change itself seems good.
> 
> Thanks,
>  Thomas

Thanks.

I based the log levels on likely frequency, e.g. the things at trace level would generate a lot of output when enabled.