Adding locate-gtid-errant command

[shlomi-noach]

locate-gtid-errant reports the names of the binary logs containing errant GTID for a given instance.

Example usage:

orchestrator-client -c locate-gtid-errant -i my-host:3306
mysql-bin.000001
mysql-bin.000004
mysql-bin.000006

Execution returns with an error when:

• there is no errant GTID
• part or all of the errant GTID is purged

[shlomi-noach]

This PR also adds the which-gtid-errant command, which outputs the errant GTID, if such exists.