Update chart to support the deployment without persistent database

Update chart to support the deployment without persistent database

In case the O-Cloud may not have the persistent volume,
this commit will continue with the deployment and servicing without
persistent database which requires the persistent volume configuration
in O-Cloud.

Test Plan:
1. Tested the application with persistence database, it was as
expected.
2. Tested the application without persistence database, it was
as expected.

Issue-ID: INF-464

Change-Id: I72c6e3cc1538d2f442e1decc3da1123d2106d0b6
Signed-off-by: Zhang Rong(Jon) <rong.zhang@windriver.com>