SOC-3698 | Space injection failed because of  JCRItemExistsException: [social] ADD PROPERTY. Item already  exists in storage

Conflicts:

	component/core/src/main/java/org/exoplatform/social/core/storage/streams/StreamInvocationHelper.java
	component/core/src/test/java/org/exoplatform/social/core/storage/ActivityStorageTest.java
	component/core/src/test/java/org/exoplatform/social/core/storage/impl/ActivityStorageImplTestCase.java