Added PersistentJsonStorageClass

PersistentJsonStorage is used to store persistent information in
json format. This class will be used by ReportManager to save
persistent report configuration.

Tested:
  - Added unit tests for new functionality
  - All other unit tests are passing

Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
Change-Id: Ib496e6782e849d910fe37c02c355047afda5c79c
diff --git a/subprojects/googletest.wrap b/subprojects/googletest.wrap
new file mode 100644
index 0000000..56da9ef
--- /dev/null
+++ b/subprojects/googletest.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/google/googletest
+revision = HEAD