Fix broken help switch

There was a typo in the `Sysexits` module name, accidentally
capitalizing the `e`.

Change-Id: Ia57ccfa7b4e6c0a3a595bf3f036e7f4cf1d24982
Reviewed-on: http://gerrit.causes.com/41213
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>