add bi aggregation function of min OK and exact OK

[elwood218]

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General information

At the moment the aggregation function of BI only got count of OK nodes bigger or same as (>=). But having a count of exact OK nodes would have the option to check if there is only one Master node in an HA-Setup or more.

Bug reports

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Proposed changes

The change here will add another option of exact OK nodes. So if I put it to 1 then only 1 OK nodes are ok and not 2. Therefore the recent "CountOK" was set to == and add another function was added called MinOK which is calculating the OK as it was before ">=". I have tested it and it worked. But the translation of the new options still needs to be added.

[elwood218]

@kain88-de Where the new translations can be added or will you do that? What else is needed here? Only rebase?