[DMAAP] Use common secret template for postgres creds

Passwords are still hardcoded in common postrgres chart but as soon as
we remove them they will be auto-generated.

Issue-ID: OOM-2250
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Change-Id: Idb34b36fe8124433f296523e6ac1a1414d8276fe
4 files changed