Add session timeout in Policies page

This patchset will provide the option to configure the session timeout
for the WebUI. The functionality will provide the below timeout options
to configure.
    1. 30 minutes
    2. 1 hour
    3. 2 hours
    4. 4 hours
    5. 8 hours
    6. 1 Day
For the API, redfish is having the following resource.
URL - /redfish/v1/SessionService
Method
    - GET (to get the configured timeout)
    - PATCH (to configure the timeout value)
Property - { "SessionTimeout": 1800 }

When the user idles up until the configured session timeout, after that
any API call from this session will get 401 status and the web UI will
gets logged out.

Change-Id: Ic7c6b4817e560ca4ceb983dc5e2af51f3ae08cf5
Signed-off-by: Kirankumar Ballapalli <kirankumarb@ami.com>
diff --git a/src/locales/en-US.json b/src/locales/en-US.json
index d331993..ff98822 100644
--- a/src/locales/en-US.json
+++ b/src/locales/en-US.json
@@ -801,6 +801,7 @@
             "errorSshEnabled": "Error enabling SSH security setting.",
             "errorVtpmDisabled": "Error disabling VirtualTPM security setting.",
             "errorVtpmEnabled": "Error enabling VirtualTPM security setting.",
+            "errorSessionTimeout": "Error configuring session timeout.",
             "successIpmiDisabled": "Successfully disabled IPMI security setting.",
             "successIpmiEnabled": "Successfully enabled IPMI security setting.",
             "successRtadDisabled": "Successfully disabled RTAD security setting.",
@@ -808,10 +809,21 @@
             "successSshDisabled": "Successfully disabled SSH security setting.",
             "successSshEnabled": "Successfully enabled SSH security setting.",
             "successVtpmDisabled": "Successfully disabled VirtualTPM security setting.",
-            "successVtpmEnabled": "Successfully enabled VirtualTPM security setting."
+            "successVtpmEnabled": "Successfully enabled VirtualTPM security setting.",
+            "successSessionTimeout": "Successfully configured the session timeout."
+        },
+        "options": {
+            "30minutes": "30 Minutes",
+            "1hour": "1 Hour",
+            "2hours": "2 Hours",
+            "4hours": "4 Hours",
+            "8hours": "8 Hours",
+            "1day": "1 Day"
         },
         "vtpm": "VirtualTPM",
-        "vtpmDescription": "Enabling vTPM makes a TPM available to the guest operating system."
+        "vtpmDescription": "Enabling vTPM makes a TPM available to the guest operating system.",
+        "webSessionTimeOut": "WEB Session Timeout",
+        "webSessionTimeOutDescription": "Change the Web session timeout in given options"
     },
     "pagePower": {
         "description": "Set a power cap to keep power consumption at or below the specified value in watts",