Addresses a regression in `podman mount` due to our mount changes
to allow concurrency by letting c/storage handle mounting and
unmounting.
Combine Mounted() and Mountpoint() into one function and query
c/storage directly to ensure we get accurate information.
Fixes: #1143
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Closes: #1144
Approved by: baude