The most complicated mapping strategy.
It is used when we have a list of maps in the configuration and
each map corresponds only to a parameter (or more) of a directive (i.e. single directive
can be mapped as multiple maps).
This tries to map each (set of) parameters of a directive as a standalone map.
The map definition's name is taken as the name of the directive to look for.
Then for all such directives, take all their parameters, chunk them up by the number of
sub-properties of the map and assign params from each chunk to a new map.
Each map is supposed to contain the "_index" property (
ApacheServerComponent.AUXILIARY_INDEX_PROP)
which is set to the index of the corresponding directive in the config file.