[COMMON] Allow use of second Node Port Prefix

OOM uses two node port prefix.
Templates were not able to use the second one.
This patch allows templates to use the second node port prefix and also
to override on a per chart basis the value of the node port prefix.

Issue-ID: OOM-1971
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I05f43e3dad93d6f0fbf575657ea41082e7c91053
1 file changed