KAA-96: server side implementation + tests
KAA-96: merged master to KAA-96
KAA-96: Refactor LogAppenderDto structure + extra logic related to delivery confirmation
KAA-96: SDK templates fix
Kaa-96: fix identation issues
KAA-213: Update Java SDK to react on log delivery errors. Update source templates.
KAA-213: Update C++ SDK to react on log delivery errors. Update source templates.
KAA-213: Cosmetic changes.
KAA-214: Fix log delivery timeout checking. Remove unused header.
KAA-96: Fixed PR comments
Merge pull request #46 from kaaproject/feature/KAA-96

Kaa-96: Logs delivery confirmation