Convert FreeNAS 12 to using single "MetaPort"
Currently my PoC FreeNAS MANIFEST hard-specifies the entire list of packages to install when creating FreeNAS. This needs to be changed to a single top-level Meta Port. This is done so that when we do updates via pkg-base, new ports will automatically be fetched as installed as dependencies of this meta-port. If we need to remove a package, we can also just drop them from the meta-port, and they will be deleted as apart of the 'pkg autoremove' routine during upgrades.
Example of TrueView Meta Port
Update FreeNAS Manifest
This commit updates FreeNAS 12 manifest to make use of the freenas meta port which we will use now to take care of all the related dependencies.
Update Freenas-ui port
This commit sets up the stage for freenas meta port by removing the pkg-install script from freenas-ui port which will be now moved to freenas meta port. The decided flow is that for freenas* related ports who use pkg-install scripts, we will move them to the freenas meta port which will take care of it.