fixes #4290 add validation for user group max name length of 255
fixes #3996 Support to assign both cores and CPUs to VMWare guests
fixes #4442 - returning nil plays nice with try_to_login.
fixes #4194, #4459 - add main_app to root_path references for isolated engines
fixes #4583 - Added Environment name to rundeck output
fixes #3221 - add missing attributes to hostgroup show response
fixes #4485 prevents undefined method when cloning a host
fixes #4581 Implement available_networks API for VMware
fixes #4557: namespaced and mounted plugins no longer cause crash on the filter screen