[COMMON][CERTS] Allow to provide custom certs easily

Instead of mandating to provide custom certificates before creation of
helm packages, let's propose to include certificates from a known
secret or configmap.
The current implementation will first search for secret and if not
provided will look for configmap.

Issue-ID: OOM-2731
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: If2f90adc18efe59c0516db9409964a236bd17a66
3 files changed