[refactor] Add variable to whiptail functions for quiet install

This is an initial change to allow for automated installs and testing.
The variable `QUIET` is checked in all whiptail functions and they are
skipped if the variable is set.

Closes #526
This commit is contained in:
William Wernert
2020-04-07 15:24:36 -04:00
parent cf8c33ccea
commit 56326026b7

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