KAA-229: Fix string serialization in unions.
KAA-229: Add function to provide file for kaa logs.
KAA-229: Update event manager api.
KAA-229: Fix unit test.
KAA-229: Update C SDK generation templates.
Merge branch 'c_sdk_refactoring' of https://github.com/kaaproject/kaa into c_sdk_refactoring