[VNFSDK] Automatically retrieve certificates

Instead of using hardcoded certificates, let's use certInitializer in
order to retrieve them.

Issue-ID: OOM-2696
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I6ed12dda660647cd0990c34f51e6c05ed533774a
12 files changed