Remove GS_OPTIONS_EXT usage from Dockerfile to simplify external usage

all these env variables can be defined wither by env variable or by system parameter, we removed the system parameter definition from the dockerfile and left only the env variables:

GS_MULTICAST_LOOKUP_PORT
GS_LRMI_PORT
GS_MANAGER_REST_PORT
GS_WEBUI_PORT
GS_WEBSTER_HTTP_PORT
GS_RMI_REGISTRY_PORT
GS_REST_PORT
GS_ZOOKEEPER_CLIENT_PORT
GS_MANAGER_ZOOKEEPER_DISCOVERY_PORT
GS_MANAGER_ZOOKEEPER_LEADER_ELECTION_PORT
SPARK_MASTER_PORT
SPARK_MASTER_WEBUI_PORT
SPARK_MASTER_REST_PORT
ZEPPELIN_PORT