Release 7.0.0: More GC options for server operation

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More GC options for server operation; reduce java GC pauses with big heap sizes.

* Removed G1 garbage collector through removing following options from 'ox-scriptconf.sh.in' file:
-XX:+UnlockExperimentalVMOptions
-XX:+UseG1GC

* Added following options to 'ox-scriptconf.sh.in' file:
-XX:+UseConcMarkSweepGC
-XX:+UseParNewGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly