Description: do not return error if libshare is missed
 Synopsis:
    # zpool import new
    cannot share 'new': : share(1M) failed
    # echo $?
    1
Index: b/usr/src/lib/libzfs/common/libzfs_mount.c
===================================================================
--- a/usr/src/lib/libzfs/common/libzfs_mount.c	2014-03-10 12:36:39.448020567 +0400
+++ b/usr/src/lib/libzfs/common/libzfs_mount.c	2014-03-10 12:37:52.162535429 +0400
@@ -716,11 +716,15 @@
 		return (0);
 
 	if ((ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
-		(void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
-		    dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
-		    zfs_get_name(zhp), _sa_errorstr != NULL ?
-		    _sa_errorstr(ret) : "");
-		return (-1);
+        if (ret != SA_CONFIG_ERR) {
+            (void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
+                dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
+                zfs_get_name(zhp), _sa_errorstr != NULL ?
+                _sa_errorstr(ret) : "");
+            return (-1);
+        } else {
+            return (0);
+        }
 	}
 
 	for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {