Force en_US.UTF-8 locale for iocage
We should forces locale settings to be 'en_US.UTF-8' for iocage fixing any unintended issues with user's locale settings.
We risk breaking all file handling and stdout/stderr
So with default locale settings, there should be no issues creating/starting/stopping/destroying jails. Locale settings could be changed and then jails should be created/started/stopped/destroyed and ensured that we don't have any issues.
This should be tested with CLI though. Checking it via freenas UI may result in unintended consequences with locale settings changed and this ticket does not affect/concern the lib portion