Display read-only repositories only with dataloss by default

Currently the dataloss command displays every outdated repository. Secondaries might be temporarily outdated as new writes arrive on the primary. Having a way to display these temporarily outdated repositories is helpful for evaluating how the replication is working. Most commonly the dataloss command is used after a failover to identify which repositories are in read-only mode and require administrator action. dataloss command should allow for displaying only the read-only repositories to ease the administrator in resolving the read-only modes after a failover.

The solution:

1. dataloss should clearly display in the output if a repository is in read-only mode by adding (read-only) qualifier next to the repository path.
2. dataloss should by default only repositories in read-only mode.
3. dataloss should have -all flag to dispaly every outdated repository.