Remove the classes that were originally singleton

Remove the classes that were originally singleton

GremlinGroovy shell singleton and groovy builder singleton
were changed from being singleton because we found
that the classes that were dynamically loaded
were never cleaned up by the garbage collector
which caused a huge increase in the memory consumption
for the traversal microservice which uses this
The conversions from singleton was already committed
but the singleton was not cleaned up earlier

Issue-ID: AAI-1811
Change-Id: Ib74d85be4c1053e7b482fa5b89b562b2352ff803
Signed-off-by: Kajur, Harish (vk250x) <vk250x@att.com>