Fixes #5643: add support for environment variable through ${node.env[XXX]} notation
Merge pull request #564 from ncharles/ust_5449/dev/5643_env_variables_3_0

Fixes #5643: add support for environment variable through ${node.env[XXX...
Fixes #5790: Deprecate ZypperManagement Technique
Merge pull request #570 from ncharles/bug_5790/dev/deprecate_zypper

Fixes #5790: Deprecate ZypperManagement Technique