packaging: setup: fixed password handling for configuration

Current implementation parses database configuration file
and takes the engine password as it appears in the config.
The file includes " characters which leads to problems for
dwh.

New implementation removes " chars before configuring own
service file.

Change-Id: I8f92fae08d86fbc1536a9bdc139ae8df1147e0d1
Bug-Url: https://bugzilla.redhat.com/990124
Signed-off-by: Alex Lourie <alourie@redhat.com>