Recover worker panic in qan.Manager.
Tweak Changelog.
Test that worker panic only causes error to be logged, not agent crash.
Worker done after logging panic.
Merge pull request #38 from percona/PCT-553

Handle qan worker panic
Update deps for mysql-log-parser PCT-552 fix: https://github.com/percona/mysql-log-parser/commit/7b7e55969a38aed37630d0aa019229c4b9f3481b
Update changelog.
Merge pull request #39 from percona/PCT-552

Fix PCT-552: percona-agent does not parse entire slow log
Add GetInfo server support to cli.
Installer does not accept empty password