contactmethod: don't look up certificate if cached
contactmethod: don't look up certificate if cached

Change-Id: Ifc26859ee8e81c9d783aa9d948406b0522973947
Tuleap: #753

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc