Fixed an issue that prevented Shardman from working with pg_probackup when PostgresSQL ran on port different from 5432.

Fixed Shardman to enable pg_probackup run on a node that is not in the Shardman cluster.

Fixed hanging of shardmanctl probackup restore that took place in some cases.

Added cleanup of the backup directory in case of a shardmanctl probackup init failure.

Improved error handling of probackup backups. Now if a backup fails on one shard, it gets terminated on the others.

Improved the behavior of shardmanctl probackup show to display a message informing of no backups when the backup_info file is missing.