zfs_main: create, clone, rename: accept -pp for non-mountable parents

Teach `zfs {create,clone,rename}` to accept a doubled `-p` flag (`-pp`)
to create non-existing ancestor datasets with `canmount=off`.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by: Ivan Shapovalov <intelfx@intelfx.name>
Closes #17000

man/man8/zfs-clone.8

@@ -62,6 +62,10 @@ Creates all the non-existing parent datasets.
 Datasets created in this manner are automatically mounted according to the
 .Sy mountpoint
 property inherited from their parent.
+If the
+.Fl p
+option is specified multiple times, parent datasets are created with
+.Sy canmount Ns = Ns Ar off .
 If the target filesystem or volume already exists, the operation completes
 successfully.
 .It Fl u

man/man8/zfs-create.8

@@ -85,6 +85,10 @@ property inherited from their parent.
 Any property specified on the command line using the
 .Fl o
 option is ignored.
+If the
+.Fl p
+option is specified multiple times, parent datasets are created with
+.Sy canmount Ns = Ns Ar off .
 If the target filesystem already exists, the operation completes successfully.
 .It Fl n
 Do a dry-run
@@ -177,6 +181,10 @@ property inherited from their parent.
 Any property specified on the command line using the
 .Fl o
 option is ignored.
+If the
+.Fl p
+option is specified multiple times, parent datasets are created with
+.Sy canmount Ns = Ns Ar off .
 If the target filesystem already exists, the operation completes successfully.
 .It Fl s
 Creates a sparse volume with no reservation.

man/man8/zfs-rename.8

@@ -103,6 +103,10 @@ Creates all the non-existing parent datasets.
 Datasets created in this manner are automatically mounted according to the
 .Sy mountpoint
 property inherited from their parent.
+Alernatively, if the
+.Fl p
+option is specified multiple times, parent datasets are created with
+.Sy canmount Ns = Ns Ar off .
 .It Fl u
 Do not remount file systems during rename.
 If a file system's