AMBARI-6607. Alerts for gmonds are generated even it gmond does not exist (aonishuk)

ambari-server/src/main/resources/stacks/HDP/2.0.6/services/NAGIOS/package/templates/hadoop-services.cfg.j2

@@ -160,6 +160,7 @@ define service {
         max_check_attempts      4
 }
 
+{% if hostgroup_defs['namenode'] %}
 define service {
         hostgroup_name	        ganglia-server
         use                     hadoop-service
@@ -170,7 +171,9 @@ define service {
         retry_check_interval    0.25
         max_check_attempts      4
 }
+{% endif %}
 
+{% if hostgroup_defs['hbasemasters'] %}
 define service {
         hostgroup_name	        ganglia-server
         use                     hadoop-service
@@ -181,7 +184,9 @@ define service {
         retry_check_interval    0.25
         max_check_attempts      4
 }
+{% endif %}
 
+{% if hostgroup_defs['resourcemanager'] %}
 define service {
         hostgroup_name	        ganglia-server
         use                     hadoop-service
@@ -192,7 +197,9 @@ define service {
         retry_check_interval    0.25
         max_check_attempts      4
 }
+{% endif %}
 
+{% if hostgroup_defs['historyserver2'] %}
 define service {
         hostgroup_name	        ganglia-server
         use                     hadoop-service
@@ -204,6 +211,7 @@ define service {
         max_check_attempts      4
 }
 {% endif %}
+{% endif %}
 
 
 {% if hostgroup_defs['snamenode'] and hostgroup_defs['namenode'] != None %}