Following from [Spike CPS-631|https://wiki.onap.org/display/DW/CPS-631+Spike%3A+Which+ObjectMapper+to+use+and+how+best+to+use+it+for+performance], decision was made to use the Jackson parser instead of GSON parser in all repos. 

So remove any use of GSON like

import com.google.gson.GsonBuilder
Gson GSON = new GsonBuilder().create()
GSON.fromJSON()
GSON.toJSON()

Replace with 

import com.fasterxml.jackson.databind.ObjectMapper
ObjectMapper objectMapper = new ObjectMapper()
objectMapper.readValue()
objectMapper.writeValueAsString()

Scope, all relevant Repos (create subtasks if needed to track and split workload)

1. CPS
2. DMI-Plugin
3. CPS-Temporal (might not be used here)

A/C

• GSON fis no longer present in any (CPS) POM files
  • ensure the relevant version property is removed too
• (code review phase) Only one ObjectMapper should be instantiated per class to save memory. Possible use @autowire annotation to ensure 'singleton' pattern. (this might affect testware!)