Create new SNMP Settings page

Created new page to display SNMP Managers.
Display the SNMP Manager's IP and port.
https://github.com/openbmc/phosphor-snmp/blob/master/docs/snmp-configuration.md

Future commits will allow the user to add and delete SNMP
managers.

Change-Id: Ia5d633c11728a580c06b25c412e8673925cdc597
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/common/services/api-utils.js b/app/common/services/api-utils.js
index 284d54e..7f2fe7f 100644
--- a/app/common/services/api-utils.js
+++ b/app/common/services/api-utils.js
@@ -85,6 +85,21 @@
                   });
           return deferred.promise;
         },
+        getSNMPManagers: function() {
+          return $http({
+                   method: 'GET',
+                   url: DataService.getHost() +
+                       '/xyz/openbmc_project/network/snmp/manager/enumerate',
+                   headers: {
+                     'Accept': 'application/json',
+                     'Content-Type': 'application/json'
+                   },
+                   withCredentials: true
+                 })
+              .then(function(response) {
+                return response.data;
+              });
+        },
         getNetworkInfo: function() {
           var deferred = $q.defer();
           $http({