RFR: 5700: Improve file and socket IO rule result texts [v4]

[Marcus Hirt]

On Mon, 26 Oct 2020 18:29:27 GMT, Jean-Philippe Bempel <github.com+4610701+jpbempel at openjdk.org> wrote:

>> Add new information along with longest event:
>>  - report the total and average pauses for the entire recording.
>>  - report the sum of all IO events for that file or host of the longest event
>> Add also some mock classes for IItemCollection with some mock events
>
> Jean-Philippe Bempel has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix typos

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/138