Redmine #5496: Fix enterprise_extension_test for ARM processors.

Because of function argument padding, the "char" argument is not
enough to trigger the stack inconsistency we are looking for in the
test. This also highlights that not all forms of stack corruption will
be detected when loading the plugin, it is just a safeguard.
cf-serverd: access "ifencrypted" shall respect "false" values, too

Until now, setting 'ifencrypted => "false"' would be treated same as
a "true" value.

Fixes: #5609
contrib/enterprise/report.pl: look at CFENGINE_MP_URL for the --url parameter default