merge fixes from 2.3.0

RELEASE_NOTES.txt

+Release 2.3.1 (XX/YY/2019)
+=============================
+- Added system LDAP utilities for verifying and creating groups
+- Prevented core files from being uploaded
+- Added support for retrieving single processing job stage via the --stage
+  option for the get-processing-job command
+
 Release 2.3.0 (04/15/2019)
 =============================
 - Updated CDB plugin for the latest CDB API changes