snmp: add SnmpdBindHost parameter

SnmpdBindHost will be useful for users who want to change the binding
options for SNMP daemon.
It has to be an array, and by the default the value is
['udp:161','udp6:[::1]:161'] like it was in puppet-tripleo profile.

Change-Id: Iccf0a8d35cc05d34272c078c97a5dddfb8e7d614
Closes-Bug: #1687628

puppet/services/snmp.yaml

@@ -28,6 +28,10 @@ parameters:
     description: The user password for SNMPd with readonly rights running on all Overcloud nodes
     type: string
     hidden: true
+  SnmpdBindHost:
+    description: An array of bind host addresses on which SNMP daemon will listen.
+    type: comma_delimited_list
+    default: ['udp:161','udp6:[::1]:161']
 
 outputs:
   role_data:
@@ -37,6 +41,7 @@ outputs:
       config_settings:
         tripleo::profile::base::snmp::snmpd_user: {get_param: SnmpdReadonlyUserName}
         tripleo::profile::base::snmp::snmpd_password: {get_param: SnmpdReadonlyUserPassword}
+        snmp::agentaddress: {get_param: SnmpdBindHost}
         tripleo.snmp.firewall_rules:
           '127 snmp':
             dport: 161

releasenotes/notes/snmp_listen-2364188f73d43b14.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Adding a new parameter to SNMP profile, SnmpdBindHost
+    so users can change the binding addresses on SNMP daemon.
+    The parameter is an array and takes the default value that
+    were previously hardcoded in puppet-tripleo.