Improve mounting as ConfigMaps and Secrets

[xlight05]

Description:
$Subject.

We need to provider a simpler interface users to mount their files/folders as Config maps and secrets in a easy way without introducing kubernetes complexities.

• Support Mounting directories - Change mount_path to mount_dir #783, Allow folders as secret/configmap mounts #778
• Mount multiple files to same directories - Use subpaths to mount files #780
• Avoid Conflicits - Add suffix to generated secret and config map names #779

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