ZP-1150 Show client capabilities in z-push-admin.

Released under the Affero GNU General Public License (AGPL) version 3.

src/z-push-admin.php

@@ -940,6 +940,7 @@ class ZPushAdminCLI {
             echo "\tVersion:\t". $device->GetKoeVersion() ."\n";
             echo "\tBuild:\t\t". $device->GetKoeBuild() ."\n";
             echo "\tBuild Date:\t". strftime("%Y-%m-%d %H:%M",$device->GetKoeBuildDate()) ."\n";
+            echo "\tCapabilities:\t". (count($device->GetKoeCapabilities()) ? implode(',', $device->GetKoeCapabilities()) : 'unknown') ."\n";
         }
 
         echo "Attention needed:\t";