repotest: remove extension

The commit openbmc/openbmc@4e8877ee removed the extension as the default
variant of this script name.  Update the tools to match.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If19b5f9e70aa2d7dd15be9aab70a6263b057aad0
1 file changed