Added encryption support for zfs recv -o / -x

One small integration that was absent from b52563 was
support for zfs recv -o / -x with regards to encryption
parameters. The main use cases of this are as follows:

* Receiving an unencrypted stream as encrypted without
  needing to create a "dummy" encrypted parent so that
  encryption can be inheritted.

* Allowing users to change their keylocation on receive,
  so long as the receiving dataset is an encryption root.

* Allowing users to explicitly exclude or override the
  encryption property from an unencrypted properties stream,
  allowing it to be received as encrypted.

* Receiving a recursive heirarchy of unencrypted datasets,
  encrypting the top-level one and forcing all children to
  inherit the encryption.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7650

include/sys/dmu_send.h

@@ -30,6 +30,7 @@
 #define	_DMU_SEND_H
 
 #include <sys/inttypes.h>
+#include <sys/dsl_crypt.h>
 #include <sys/spa.h>
 
 struct vnode;
@@ -72,8 +73,9 @@ typedef struct dmu_recv_cookie {
 } dmu_recv_cookie_t;
 
 int dmu_recv_begin(char *tofs, char *tosnap,
-    struct dmu_replay_record *drr_begin,
-    boolean_t force, boolean_t resumable, char *origin, dmu_recv_cookie_t *drc);
+    struct dmu_replay_record *drr_begin, boolean_t force, boolean_t resumable,
+    nvlist_t *localprops, nvlist_t *hidden_args, char *origin,
+    dmu_recv_cookie_t *drc);
 int dmu_recv_stream(dmu_recv_cookie_t *drc, struct vnode *vp, offset_t *voffp,
     int cleanup_fd, uint64_t *action_handlep);
 int dmu_recv_end(dmu_recv_cookie_t *drc, void *owner);