generate: condense output

[joshk0]

Moved from pre-OSS repository

context

Currently, kdt generate is used to render Kubernetes manifests for one or more deployment artifacts. It is quite verbose, such that the log output is ignored on success, and hard to parse on error because the error is duplicated and intertwined with INFO-level logs.

request

The log output of kdt generate can be reduced and improved to show:

• values for variables per artifact in ERB templates
• what artifacts were generated
• a summary of the file or folder contents of an artifact; specifically what was included or excluded by the include_dir and exclude_dir features
• if there was an error, a concise stacktrace of an error, unduplicated

acceptance criteria

• Output of kdt generate is a useful summary on command success, and is an actionable summary on command failure

previously DEV-1089