Update zfs-functions.in

The init.d zfs-share script does not perform the intended 
action without having a variable set for ZFS_SHARE and 
ZFS_UNSHARE

Assign default values to ZFS_SHARE and ZFS_UNSHARE. Export 
the environment variables after sourcing the configuration 
file.

Reviewed-by: Richard Yao <ryao@gentoo.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Georgy Yakovlev <gyakovlev@gentoo.org>
Signed-off-by: Allen Holl <allen.m.holl@gmail.com>
Closes #10341 
Closes #10382

etc/zfs/zfs-functions.in

@@ -96,8 +96,8 @@ ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
 # Sensible defaults
 ZFS_MOUNT='yes'
 ZFS_UNMOUNT='yes'
-
-export ZFS ZED ZPOOL ZPOOL_CACHE ZFS_MOUNT ZFS_UNMOUNT
+ZFS_SHARE='yes'
+ZFS_UNSHARE='yes'
 
 # Source zfs configuration, overriding the defaults
 if [ -f @initconfdir@/zfs ]; then
@@ -106,6 +106,8 @@ fi
 
 # ----------------------------------------------------
 
+export ZFS ZED ZPOOL ZPOOL_CACHE ZFS_MOUNT ZFS_UNMOUNT ZFS_SHARE ZFS_UNSHARE
+
 zfs_action()
 {
 	local MSG="$1";	shift