The test for rhosydd install several packages on target images, one of them
is ssl-cert, however, it fails to install since it depends on bash.

Since bash is an essential package, there is no sense is adding it as
a dependency, so update the testcase to install it.

This issue is not present in SDK images since bash is preinstalled,
but this fix should not cause any consequences.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>