Add splat module to zfs.sh script

The splat module is only needed for the spl regression tests.
But if we add it to MODULES then 'zfs.sh -u' will be able to
unload it if needed,  The downside if 'zfs.sh' will always
load it but it's overhead is minimal and in a production
setting you'll always be doing a 'modprobe zfs' anyway so
this is really just for testing.

config/zfs-build.m4

@@ -74,6 +74,7 @@ KERNEL_MODULES=(                                      \\
 
 SPL_MODULES=(                                         \\
         \${SPLBUILD}/spl/spl.ko                        \\
+        \${SPLBUILD}/splat/splat.ko                    \\
 )
 
 ZFS_MODULES=(                                         \\

scripts/common.sh.in

@@ -11,7 +11,7 @@ SCRIPT_CONFIG=.script-config
 if [ -f "${basedir}/../${SCRIPT_CONFIG}" ]; then
 . "${basedir}/../${SCRIPT_CONFIG}"
 else
-MODULES=(zlib_deflate spl zavl znvpair zunicode zcommon zfs)
+MODULES=(zlib_deflate spl splat zavl znvpair zunicode zcommon zfs)
 fi
 
 PROG="<define PROG>"