epp-01: check that the server accepts unordered certificates #253

Section 4.4.2 of RFC 8446 states:

"implementations SHOULD be prepared to handle potentially extraneous certificates and arbitrary orderings from any TLS version, with the exception of the end-entity certificate which MUST be first.".

The epp-01 test case should be updated to validate this requirement.

Internal ref: NRRST-1531