[FEATURE REQUEST] Add mountpoint parameter to zpool.present state

[dkacar-oradian]

Is your feature request related to a problem? Please describe.
It's impossible to mount zpool created by zpool.present state to the arbitrary location in the file system hierarchy because it doesn't accept mountpoint argument (-m option to zpool create), so it will always go to the default location. This is highly undesirable in some circumstances. For example, I'm currently porting something that's using BTRFS to ZFS and it would be really nice if the file system hierarchy could stay the same.

Describe the solution you'd like
zpool.present state should accept mountpoint parameter, probably as a property in the config parameter.
Note that the zpool.create module accepts mountpoint, so the state should just accept it and pass it on because it's already using that module to create zpool if it doesn't exist. In other words, I expect this to be a very small code addition.

Describe alternatives you've considered
At the moment I had to ignore zpool.present state. Instead I've created a stateful script which accepts all parameters I care about and calls zpool create directly. That works, but doesn't have all the features that the zpool.present state has, so it isn't really a desirable alternative.

Additional context
Add any other context or screenshots about the feature request here.

Please Note
If this feature request would be considered a substantial change or addition, this should go through a SEP process here https://github.com/saltstack/salt-enhancement-proposals, instead of a feature request.