Fix of alarm-go client library rmr init

ric-dep alarmmanager helmchart have appconfig.yaml
that defines ALARM_MANAGER_SERVICE_NAME and ALARM_MANAGER_SERVICE_PORT
client should use those variables to give rmr endpoint of alarmanager

Other way is to give PLT_NAMESPACE env, which then uses
default names for given namespace.

Signed-off-by: Juha Hyttinen <juha.hyttinen@nokia.com>
Change-Id: If82eb03ed5684ac54a35fc522ba35515bbc0343e