Prohibit horizontal resizing of textarea inside origin-modal-popup

Supports https://github.com/openshift/origin-web-console/issues/2716

dist/less/_modal-popup.less

@@ -86,6 +86,10 @@
     margin-top: 0;
     padding: 10px @grid-gutter-width 10px (@grid-gutter-width / 2);
   }
+
+  textarea {
+    resize: vertical; // so the textarea cannot be resized wider than the popup
+  }
 }
 
 .origin-modal-popup-backdrop.modal-backdrop {

dist/origin-web-common.css

@@ -415,6 +415,9 @@ div.hopscotch-bubble .hopscotch-nav-button.prev {
   margin-top: 0;
   padding: 10px 40px 10px 20px;
 }
+.origin-modal-popup textarea {
+  resize: vertical;
+}
 .origin-modal-popup-backdrop.modal-backdrop {
   background-color: transparent;
   cursor: not-allowed;

src/styles/_modal-popup.less

@@ -86,6 +86,10 @@
     margin-top: 0;
     padding: 10px @grid-gutter-width 10px (@grid-gutter-width / 2);
   }
+
+  textarea {
+    resize: vertical; // so the textarea cannot be resized wider than the popup
+  }
 }
 
 .origin-modal-popup-backdrop.modal-backdrop {