Adapted Stampede behaviour to support the new config file

[codecov-io]

Codecov Report

Merging #168 into devel will decrease coverage by 0.01%. The diff coverage is 9.52%.

@@             Coverage Diff              @@
##              devel     #168      +/-   ##
============================================
- Coverage     21.09%   21.07%   -0.02%     
- Complexity     2001     2002       +1     
============================================
  Files           906      906              
  Lines         28349    28370      +21     
  Branches       2451     2451              
============================================
+ Hits           5979     5980       +1     
- Misses        21938    21958      +20     
  Partials        432      432

Impacted Files	Coverage Δ	Complexity Δ
...ackaging/util/MongoClientConfigurationFactory.java	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...main/java/com/torodb/stampede/StampedeService.java	8.51% <0%> (-0.19%)	1 <0> (ø)
...nfig/model/protocol/mongo/AbstractReplication.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...e/main/src/main/java/com/torodb/stampede/Main.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...de/config/model/mongo/replication/Replication.java	95.45% <100%> (-0.2%)	11 <1> (ø)
.../main/java/com/torodb/stampede/StampedeConfig.java	44% <23.07%> (-25.24%)	4 <1> (+1)

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[gortiz]

I the "single shard" usage that @teoincontatto found