In find api calls, join url set items with semi-colon instead of comma.
Comma is already used.
Merge branch 'develop' of github.com:MicrosmartSA/ubiquity-commons into develop

* 'develop' of github.com:MicrosmartSA/ubiquity-commons:
  Cluster adapter can now cluster_log(hash)
  Fix typo in function name
  Cluster monitor now has start of /proc/meminfo reporting
  Start work on cluster monitor process
  Make database adapter use loggable
  Restructure cluster components
  Restructure cluster components
  Make database adapter use loggable for message output
  Make runner write and remove its PID file
  Allow loggable to log message types (info, warn, error, etc)