Rework cpuShares into cpuQuota

cpuShares is the relative weight wrt other apps. This is used when
there is contention for CPU. If we want this, maybe we implement
a UI where we show all the apps and let the user re-order them.
As it stands, it is confusing.

cpuQuota is a more straightforward "hard limit" of the CPU% that you
want the app to consume.

Can be tested with : stress -c 8 -t 20s

dashboard/src/js/client.js

@@ -3705,6 +3705,8 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
                 return 'Memory limit ' + appName('of', app) + ' was set to ' + data.memoryLimit;
             } else if (data.cpuShares) {
                 return 'CPU shares ' + appName('of', app) + ' was set to ' + Math.round((data.cpuShares * 100)/1024) + '%';
+            } else if (data.cpuQuota) {
+                return 'CPU quota ' + appName('of', app) + ' was set to ' + data.cupQuota + '%';
             } else if (data.env) {
                 return 'Env vars ' + appName('of', app) + ' was changed';
             } else if ('debugMode' in data) { // since it can be null