Fix code style warnings

...st/scala/nl/lumc/sasc/biopet/core/config/ConfigTest.scala

...ala/nl/lumc/sasc/biopet/core/config/ConfigValueTest.scala

...la/nl/lumc/sasc/biopet/core/config/ConfigurableTest.scala

...test/scala/nl/lumc/sasc/biopet/extensions/GsnapTest.scala

...xtensions/picard/CollectAlignmentSummaryMetricsTest.scala

...opet/extensions/picard/CollectInsertSizeMetricsTest.scala

...mc/sasc/biopet/extensions/picard/MarkDuplicatesTest.scala

.../test/scala/nl/lumc/sasc/biopet/tools/FastqSyncTest.scala

...rc/test/scala/nl/lumc/sasc/biopet/tools/SeqStatTest.scala

...c/test/scala/nl/lumc/sasc/biopet/tools/VcfStatsTest.scala

...t/scala/nl/lumc/sasc/biopet/tools/VepNormalizerTest.scala

.../test/scala/nl/lumc/sasc/biopet/tools/WipeReadsTest.scala

...est/scala/nl/lumc/sasc/biopet/utils/ConfigUtilsTest.scala

...rc/test/scala/nl/lumc/sasc/biopet/utils/PackageTest.scala