Initial alternate architecture fetch/create support

[JRGTH]

This PR adds Initial architecture fetch/create support as an experimental new feature, only 32-Bit(i386) is supported.

Usage examples:

Bootstrap an alternate release/arch(--i386|--32bit):

root@nas-mserver: ~# bastille bootstrap 12.1-RELEASE --i386
Bootstrapping FreeBSD distfiles...
/mnt/storage/bastille/cache/12.1-RELEASE-i386/MANIFEST         782  B 5920 kBps    00s
/mnt/storage/bastille/cache/12.1-RELEASE-i386/base.txz         142 MB  476 kBps 05m06s
Validated checksum for 12.1-RELEASE-i386:base.txz.
MANIFEST:4c978fb0d9c4f65e0089718f0e905fd5a8c2651582de050df6b7f49a8481a169
DOWNLOAD:4c978fb0d9c4f65e0089718f0e905fd5a8c2651582de050df6b7f49a8481a169
Extracting FreeBSD 12.1-RELEASE-i386 base.txz.

Bootstrap successful.
See 'bastille --help' for available commands.

Create a jail from an alternate release/arch:

root@nas-mserver: ~# bastille create folsom 12.1-RELEASE-i386 10.0.0.10 em0
Valid: (10.0.0.10).
Valid: (em0).

NAME: folsom.
IP: 10.0.0.10.
INTERFACE: em0.
RELEASE: 12.1-RELEASE-i386.

syslogd_flags: -s -> -ss
sendmail_enable: NO -> NO
sendmail_submit_enable: YES -> NO
sendmail_outbound_enable: YES -> NO
sendmail_msp_queue_enable: YES -> NO
cron_flags:  -> -J 60

Destroy an alternate release/arch:

root@nas-mserver: ~# bastille destroy 12.1-RELEASE-i386
Deleting base: 12.1-RELEASE-i386.

Regards

[gallexme]

Looks good so far 👍