configurable profile name prefix for all temp credentials

[fstab50]

Originally reported by: Blake Huber (Bitbucket: blakeca00, GitHub: Unknown)

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credentials generated need to be identified as temp creds via a prefix, which needs to be user defined:

• set by user via setup init script
• parameterized and read at runtime in .cfg file in config_dir

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• Bitbucket: https://bitbucket.org/blakeca00/stsaval/issue/10