The only two that we need are ShellSyntaxError and ShellError, others are not
used, so remove them.
(Bitbake rev: abee2ff5ee71bf8c3221cd9d3cd4243ebb4ca273)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>