Fix summer options propagation

[ttim]

Currently if you have flatMap().name('flatMap').sumByKey().name('sumByKey') and you have some Summer options on both flatMap and sumByKey for both of nodes (for partial aggregation on flatMap and for final aggregation on sumByKey) only options from flatMap will be applied.

Root cause of this is in a way we get options for Nodes - we get options for first producer in producers chain corresponding to Node. In case of SummerNode members contains two Producers - IdentityKeyedProducer and Summer.

This PR fixes that by passing Producer instance to BuildSummer which is used to get options for summer.

[codecov-io]

Codecov Report

Merging #739 into develop will increase coverage by 0.3%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop     #739     +/-   ##
==========================================
+ Coverage    71.88%   72.18%   +0.3%     
==========================================
  Files          153      153             
  Lines         3735     3736      +1     
  Branches       202      204      +2     
==========================================
+ Hits          2685     2697     +12     
+ Misses        1050     1039     -11

Impacted Files	Coverage Δ
...n/scala/com/twitter/summingbird/planner/Node.scala	83.78% <100%> (+0.22%)	:arrow_up:
...twitter/summingbird/storm/SummerBoltProvider.scala	100% <100%> (ø)	:arrow_up:
...itter/summingbird/storm/StormTopologyBuilder.scala	94.44% <100%> (ø)	:arrow_up:
...la/com/twitter/summingbird/storm/BuildSummer.scala	75% <100%> (+25%)	:arrow_up:
.../com/twitter/summingbird/storm/SpoutProvider.scala	97.05% <100%> (ø)	:arrow_up:
...witter/summingbird/storm/FlatMapBoltProvider.scala	100% <100%> (ø)	:arrow_up:
...a/com/twitter/summingbird/storm/StormTestRun.scala	60% <0%> (-6.67%)	:arrow_down:
...ain/scala/com/twitter/summingbird/TestGraphs.scala	87.89% <0%> (-0.64%)	:arrow_down:
...om/twitter/summingbird/online/option/Summers.scala	55.88% <0%> (+23.52%)	:arrow_up:

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[johnynek]

👍