Move jail_path_configured method to the utils module

Merge:	releng/9.1.0
(cherry picked from commit 6e9abf8c2cd128f4e5b2d471ba7ca8a50e833da1)
Rename views and urls accordingly

Merge:	releng/9.1.0
(cherry picked from commit cf9552443c671ac3988fa292ea1f96c79033bf9a)
Add method to auto configure jail

This will be use to auto configure jail in first plugin install.
The first ZFS volume found will be selected. A dataset called jails
will be created, if it already exists then append "_N" where N 2..100
until a dataset is not found.

Merge:	releng/9.1.0
(cherry picked from commit 3bc65afe8c9d566bed09216e21f0b5ab482ee8ed)
Use jail_auto_configure prior to plugin install or upload

Merge:	releng/9.1.0
(cherry picked from commit fac1747f92ca8f480edcc93c1d77a40e22584c71)