mirror defaults to True despite documentation being misleading

[andreleblanc11]

The mirror options' documentation states that it defaults to off.

We've discovered (the hard way) that this only seems to be true for a subscriber.
This is further emphasized in the documentation in this table where only the subscriber has mirror False in the Key Option Settings field.

The reason why this has been noticed recently is because v3.00.57 of sr3 has been added to operational servers. The change in #1337 has broken some of our configurations.

We had sarra/sender configs that had mirror False set after/reject statements in a configuration. So, because the masks' now get applied correctly and mirror defaults to True in sarra/senders, this caused unintended behaviours.

i.e.

...
directory /path/to/somewhere
accept .*something.*
mirror False                                      <- This used to get applied to all of the masks' in v3.00.56, but won't do anything in v3.00.57
...

Options

• We could default mirror to False for all configs, but that would require an audit of all of our current sr3 configs and would likely be a lot of work.
• We can update the documentation to reflect that mirror defaults to True, but defaults to False for a subscriber.