Add new iocage API call to clean all RELEASEs

REST Request:
-------------------------------
PUT /sysadm/iocage
{
   "action" : "cleanreleases"
}

WebSocket Request:
-------------------------------
{
   "id" : "fooid",
   "namespace" : "sysadm",
   "args" : {
      "action" : "cleanreleases"
   },
   "name" : "iocage"
}

Response:
-------------------------------
{
  "args": {
    "cleanreleases": {
      "success": "All RELEASEs have been cleaned."
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -389,6 +389,10 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmIocageRequest(const QJsonVal
     bool ok = false;
     if(keys.contains("action")){
       QString act = JsonValueToString(in_args.toObject().value("action"));
+      if(act=="cleanreleases"){
+	ok = true;
+        out->insert("cleanreleases", sysadm::Iocage::cleanReleases());
+      }
       if(act=="cleanjails"){
 	ok = true;
         out->insert("cleanjails", sysadm::Iocage::cleanJails());

src/server/library/sysadm-iocage.cpp

@@ -12,6 +12,29 @@ using namespace sysadm;
 
 //PLEASE: Keep the functions in the same order as listed in pcbsd-general.h
 
+// Clean all RELEASEs on a box
+QJsonObject Iocage::cleanReleases() {
+  QJsonObject retObject;
+
+  QStringList output = General::RunCommand("iocage clean -fr ").split("\n");
+
+  for ( int i = 0; i < output.size(); i++)
+  {
+    // This means either a mount is stuck or a jail cannot be stopped,
+    // give them the error.
+    if ( output.at(i).indexOf("ERROR:") != -1 ) {
+      retObject.insert("error", output.at(i));
+      break;
+    } else {
+      // iocage does a spinner for these that is distracting to see returned,
+      // returning what a user wants to actually see.
+      retObject.insert("success", "All RELEASEs have been cleaned.");
+    }
+  }
+
+  return retObject;
+}
+
 // Clean all jails on a box
 QJsonObject Iocage::cleanJails() {
   QJsonObject retObject;

src/server/library/sysadm-iocage.h

@@ -14,6 +14,7 @@ namespace sysadm{
 
 class Iocage{
 public:
+	static QJsonObject cleanReleases();
 	static QJsonObject cleanJails();
 	static QJsonObject capJail(QJsonObject);
 	static QJsonObject deactivatePool(QJsonObject);