Make sure to check/bootstrap directories first

[JRGTH]

This hotfix will check/bootstrap directories first wen bootstrapping a Linux release, since it may happens that someone may install Bastille to initially play with Linux jails before bootstrapping a FreeBSD release first, leading to directories not found errors and creating legacy directories under ZFS setups.

[JRGTH]

This will override the case options by the user defined option(s) automatically.
Just add bastille_export_options="--optionA --optionB" to bastille.conf.
Or simply export bastille_export_options="--optionA --optionB" environment variable.

To restore the standard case options, empty bastille_export_options="" in bastille.conf,
Or unset bastille_export_options environment variable.

Reference #443

Example on the behavior:

# bastille export test
Error: Stream can not be written to a terminal.
You must redirect standard output.

Error: An export option is required, see 'bastille export, otherwise the user must redirect to standard output.
# bastille export test > /tmp/test_backup
# bastille export test | gzip > /tmp/test_img.gz
# export bastille_export_options="--gz"
# bastille export test
Default export option: '--gz'
Exporting 'test' to a compressed .gz image...
Creating temporary ZFS snapshot for export...
Sending ZFS data stream...
 85.9%
Exported '/mnt/storage/bastille/backups/test_2022-01-04-164543.gz' successfully.
# export bastille_export_options="--gz --verbose"
# bastille export test
Default export option: '--gz --verbose'
Exporting 'test' to a compressed .gz image...
Creating temporary ZFS snapshot for export...
Sending ZFS data stream...
full send of storage/bastille/jails/test@bastille_test_2022-01-04-164553 estimated size is 50.1K
full send of storage/bastille/jails/test/root@bastille_test_2022-01-04-164553 estimated size is 7.00M
total estimated size is 7.04M
full send of storage/bastille/jails/test@bastille_test_2022-01-04-164553 estimated size is 50.1K
TIME        SENT   SNAPSHOT
full send of storage/bastille/jails/test/root@bastille_test_2022-01-04-164553 estimated size is 7.00M
TIME        SENT   SNAPSHOT
 85.9%
Exported '/mnt/storage/bastille/backups/test_2022-01-04-164553.gz' successfully.
# 
# unset bastille_export_options
# bastille export test
Error: Stream can not be written to a terminal.
You must redirect standard output.

Error: An export option is required, see 'bastille export, otherwise the user must redirect to standard output.

Notes:
When setting this config/environment variable, this should be fully specified with --xyz

Example:
export bastille_export_options="--gz --verbose" etc.

[cedwards]

@JRGTH can you please create topic branches and separate the export code from the bootstrap patch? I can help you in Discord if you need.