[PORTAL] Simplify cert retrieval script

As retrieving values is now done via a generic script, let's clean a
little bit cert retrieval in order to remove unneeded part.

Issue-ID: OOM-2688
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: Ifdd2ce7387d00e0a0c341c395f4454393d3f321d
2 files changed