Misc interactive init changes

[chasefleming]

Closes:

• Change messaging at end of install #1502
• Change setup to init #1503
• [IMPROVEMENT] Add target directory option for emulator key generation #1583

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
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[ianthpun]

beyond the commented code (as discussed async), rest of the logic looks good. THank you!