Add keepAliveInterval CB SDK support

templates/gluu-couchbase.properties

@@ -23,6 +23,14 @@ connection.mutation-tokens-enabled: false
 # Default scan consistency. Possible values are: not_bounded, request_plus, statement_plus
 connection.scan-consistency: not_bounded
 
+# Sets the time of inactivity, in milliseconds, after which some services
+# will issue a form of keep-alive request to their corresponding server/nodes
+# (default is 30s, values <= 0 deactivate the idle check).
+#connection.keep-alive-interval=4000
+
+# Customize the timeout used for keepalive operations
+#connection.keep-alive-timeout=2500
+
 # Enable scopes support. Default value: false
 # connection.enable-scope-support: true