OpenZFS 8600 - ZFS channel programs - snapshot

Authored by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Approved by: Robert Mustacchi <rm@joyent.com>
Ported-by: Don Brady <don.brady@delphix.com>

ZFS channel programs should be able to create snapshots.
In addition to the base snapshot functionality, this entails extra
logic to handle edge cases which were formerly not possible, such as
creating then destroying a snapshot in the same transaction sync.

OpenZFS-issue: https://www.illumos.org/issues/8600
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/68089b8b

include/sys/zcp.h

@@ -14,7 +14,7 @@
  */
 
 /*
- * Copyright (c) 2016 by Delphix. All rights reserved.
+ * Copyright (c) 2016, 2017 by Delphix. All rights reserved.
  */
 
 #ifndef _SYS_ZCP_H
@@ -137,8 +137,6 @@ typedef struct zcp_lib_info {
 	const zcp_arg_t kwargs[2];
 } zcp_lib_info_t;
 
-int zcp_nvlist_to_lua(lua_State *, nvlist_t *, char *, int);
-
 #ifdef	__cplusplus
 }
 #endif