Declare an Java9 JPMS Automatic-Module-Name for core and test

[simonbasle]

See reactor/reactor#667

[codecov-io]

Codecov Report

Merging #1692 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1692      +/-   ##
============================================
+ Coverage     84.35%   84.39%   +0.04%     
- Complexity     3931     3933       +2     
============================================
  Files           362      362              
  Lines         30048    30048              
  Branches       5590     5590              
============================================
+ Hits          25347    25360      +13     
+ Misses         3084     3082       -2     
+ Partials       1617     1606      -11

Impacted Files	Coverage Δ	Complexity Δ
...va/reactor/core/publisher/ParallelMergeReduce.java	69.42% <0%> (-3.31%)	3% <0%> (ø)
...c/main/java/reactor/core/publisher/FluxReplay.java	84.31% <0%> (+0.15%)	25% <0%> (ø)	⬇️
...ain/java/reactor/core/publisher/FluxPublishOn.java	86.59% <0%> (+0.2%)	6% <0%> (ø)	⬇️
...c/main/java/reactor/core/publisher/FluxCreate.java	86.26% <0%> (+0.24%)	8% <0%> (ø)	⬇️
.../main/java/reactor/core/publisher/FluxFlatMap.java	94.78% <0%> (+0.38%)	13% <0%> (ø)	⬇️
...ava/reactor/core/publisher/EventLoopProcessor.java	80.82% <0%> (+0.51%)	53% <0%> (+1%)	⬆️
...main/java/reactor/core/publisher/FluxGenerate.java	82.2% <0%> (+0.61%)	7% <0%> (ø)	⬇️
...java/reactor/core/scheduler/ExecutorScheduler.java	79.86% <0%> (+0.69%)	12% <0%> (ø)	⬇️
...java/reactor/core/publisher/FluxFirstEmitting.java	75.18% <0%> (+0.72%)	8% <0%> (ø)	⬇️
.../java/reactor/core/publisher/BlockingIterable.java	78.12% <0%> (+1.04%)	7% <0%> (ø)	⬇️
... and 2 more

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