Add new iocage API call to destroy jails.

This uses the `force` switch to bypass interaction.

REST Request:
-------------------------------
PUT /sysadm/iocage
{
   "action" : "destroyjail",
   "jail" : "test"
}

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

Response:
-------------------------------
{
  "args": {
    "destroyjail": {
      "success": {
        "Destroying": " 3030c554-d05e-11e5-8209-d05099728dbf"
      }
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/server/WebBackend.cpp

@@ -471,6 +471,10 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmIocageRequest(const QJsonVal
     bool ok = false;
     if(keys.contains("action")){
       QString act = JsonValueToString(in_args.toObject().value("action"));
+      if(act=="destroyjail"){
+	ok = true;
+        out->insert("destroyjail", sysadm::Iocage::destroyJail(in_args.toObject()));
+      }
       if(act=="createjail"){
 	ok = true;
         out->insert("createjail", sysadm::Iocage::createJail(in_args.toObject()));

src/server/library/sysadm-iocage.cpp

@@ -12,6 +12,44 @@ using namespace sysadm;
 
 //PLEASE: Keep the functions in the same order as listed in pcbsd-general.h
 
+// Destroy a jail on the box
+QJsonObject Iocage::destroyJail(QJsonObject jsin) {
+  QJsonObject retObject;
+
+  QStringList keys = jsin.keys();
+  if (! keys.contains("jail") ) {
+    retObject.insert("error", "Missing required keys");
+    return retObject;
+  }
+
+  // Get the key values
+  QString jail = jsin.value("jail").toString();
+  QStringList output;
+
+  output = General::RunCommand("iocage destroy -f " + jail).split("\n");
+
+  QJsonObject vals;
+  for ( int i = 0; i < output.size(); i++)
+  {
+    if ( output.at(i).isEmpty() )
+      break;
+
+    if ( output.at(i).indexOf("ERROR:") != -1 ) {
+      retObject.insert("error", output.at(i));
+      return retObject;
+    } else {
+      QString key = output.at(i).simplified().section(":", 0, 0);
+      QString value = output.at(i).simplified().section(":", 1, 1);
+
+      vals.insert(key, value);
+    }
+  }
+
+  retObject.insert("success", vals);
+
+  return retObject;
+}
+
 // Create a jail on the box
 QJsonObject Iocage::createJail(QJsonObject jsin) {
   QJsonObject retObject;

src/server/library/sysadm-iocage.h

@@ -14,6 +14,7 @@ namespace sysadm{
 
 class Iocage{
 public:
+	static QJsonObject destroyJail(QJsonObject);
 	static QJsonObject createJail(QJsonObject);
 	static QJsonObject cloneJail(QJsonObject);
 	static QJsonObject cleanAll();