Fix the sonar issue and clm issue

. Fix the bugs by using try-with-resources method
. Add unit test for GsonUtil
. Fix the org.springframework : spring-web issue by removing
  the dependency in forwarding plugin

Change-Id: I01f6461ea2a0f0363247dd3571dd56dcf68a7f90
Issue-ID: MULTICLOUD-569
Signed-off-by: liboNet <libo.zhu@intel.com>
8 files changed