Remove parkinglot from the channel snapshot

Legacy channel drivers often include the ability to set a default parking lot
on an endpoint basis; when channels are created for that endpoint, they inherit
the parkinglot option. Parking used to use this option more frequently; while
it is still supported, other options (such as using channel variables or
creation of a custom parkinglot) are supported. More importantly, conveying the
parkinglot information through a channel snapshot isn't terribly useful - it
is rarely (if ever) changed on a channel and some consumers of channel
snapshots, such as ARI, will never use the information.

(closes issue ASTERISK-21968)
Reported by: Matt Jordan

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@393716 f38db490-d61c-443f-a65b-d21fe96a405b