accept-fail implemented on the server side
fail-type checked on server
ErroneousTest works as expected
Merge remote-tracking branch 'origin/develop' into acceptFail-feature

Conflicts:
	backend-hz/src/main/java/ru/taskurotta/backend/hz/serialization/ErrorContainerStreamSerializer.java
	backend-hz/src/main/java/ru/taskurotta/backend/hz/serialization/SerializationTools.java
	server/src/main/java/ru/taskurotta/server/GeneralTaskServer.java
fixed tests after merge