unit tests and XQ update

[pom11]

101

QA

• [ ] replicate unit test from auto_test/README.md

105

QA

• [x] Check if xquery_event_processor resumes indexing after lost internet connection
• [x] Check if xquery_event_processor doesnt restart at lost internet connection
• [x] Check if xquery_db_processor is able to migrate dbs after changing a xquery input file (check if migrating from AVAX config to ETH config works)