net-mgmt/cacti-spine: Update to 1.2.26

Changes:
  * Errors cam be reported when uptime OID is not present
  * MySQL reconnect option is depreciated
  * Spine does not check a host with no poller items
  * Poller may report the wrong number of devices polled
  * Allow users to override the threads setting at the command line
  * Allow spine to run in ping-only mode