Initialize RuntimeConfigArgument unittests
Refs: #4058
Mock calls to kamaki.cli.config.Config methods
Merge branch 'feature-test-command-tree' into develop
Complete ConfigArgument testing
Fully test argument.Argument
Initialize unittests for argument.Argument
Also, make argument package a directory
Improve error message when image meta file exists
Fully test CommandTree
Accepte tilda as a character for a cloud name
Refs: #4126
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