Add parser support of new schema version

Add parser support of new schema version

Version 1 of xml with initial values is not supported from now.
From now software backend will not support encrypted data.
Allow parser to accept xml version 2.
Initial values files will contain information about
type of backend that should be used to store data.

Change-Id: Ib3a73b14148a2476ab288ca364fffe9289400ebd