Fixes for procfs files backed by linked lists

There are some issues with the way the seq_file interface is implemented
for kstats backed by linked lists (zfs_dbgmsgs and certain per-pool
debugging info):

* We don't account for the fact that seq_file sometimes visits a node
  multiple times, which results in missing messages when read through
  procfs.
* We don't keep separate state for each reader of a file, so concurrent
  readers will receive incorrect results.
* We don't account for the fact that entries may have been removed from
  the list between read syscalls, so reading from these files in procfs
  can cause the system to crash.

This change fixes these issues and adds procfs_list, a wrapper around a
linked list which abstracts away the details of implementing the
seq_file interface for a list and exposing the contents of the list
through procfs.

Reviewed by: Don Brady <don.brady@delphix.com>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: John Gallagher <john.gallagher@delphix.com>
External-issue: LX-1211
Closes #7819

include/sys/zfs_debug.h

@@ -76,13 +76,6 @@ extern void __dprintf(const char *file, const char *func,
 
 extern void zfs_panic_recover(const char *fmt, ...);
 
-typedef struct zfs_dbgmsg {
-	list_node_t zdm_node;
-	time_t zdm_timestamp;
-	int zdm_size;
-	char zdm_msg[1]; /* variable length allocation */
-} zfs_dbgmsg_t;
-
 extern void zfs_dbgmsg_init(void);
 extern void zfs_dbgmsg_fini(void);