Limit ZFS list to direct descendants of ${ZPOOL}/poudriere.

It is not necessary to search e.g. ports trees filesystems everywhere
and if a given ports tree is composed of multiple file-systems, they
will inherit parents FS attributes, making poudriere confused. Limiting
zfs list scope fix these two problems.
Fix INDEX building after cd0cf556.

Pointy hat to:	bapt@
Use 127.0.0.1 for no network jail
Merge branch 'master' of etoilebsd.net:poudriere
Copy README into README.wiki, this will become the new main page
Convert to wiki format
Change bullets to wiki format
Fix some code rendering
s/code/verbatim/ in wiki
Fix poudriere jail -s and -k
Rename README.wiki into index.wiki
correct portshaker.conf alignement
Add log location
Readd logging for testport
Remove the useless quotes
Update portshaker(8) instructions.
Sync index.wiki with README so that the website is in sync with the readme
Align correctly
Fix repository creation using pkgng from the jail
Document jail -i option