Includes general improvements & bug fixes and support for GitHub Enterprise Server v3.9.0

• Set restore status on all cluster nodes Set restore status on all cluster nodes #274
• Fix pages backups and restores in GitHub Enterprise 11.10 Fix pages backups and restores in GitHub Enterprise 11.10 #275
• Backup and restore custom CA certificates Backup and restore custom CA certificates #281
• Set the benchmark file path consistently Set the benchmark file path consistently #283
• Suppress dd output noise Suppress dd output noise #289
• Track completeness of Elasticsearch JSON dumps Track completeness of Elasticsearch JSON dumps #298
• Use existing Elasticsearch indices to speed up transfer during a restore Use existing Elasticsearch indices to speed up transfer during a restore #310
• Include the user data directory in the benchmark name Include the user data directory in the benchmark name #311
• Use calculated routes when backing up storage data from a cluster Use calculated routes when backing up storage data from a cluster #318
• Refresh the existing indices when restoring Elasticsearch indices to cluster Refresh the existing indices when restoring Elasticsearch indices to cluster #328
• Use git to generate short name for SSH multiplex control path Use git to generate short name for SSH multiplex control path  #335

/cc @github/backup-utils