Position so ui-select overlays when appended to body.

Fixes bug https://bugzilla.redhat.com/show_bug.cgi?id=1479114

dist/less/_ui-select.less

 /* Fix some styles with the angular-ui-select bootstrap theme that isn't right when combined with all of our styles */
+
+// ensure ui-select dropdown overlays when appended to body
+body > .ui-select-bootstrap.open {
+  z-index: @zindex-modal;
+}
 .ui-select-bootstrap {
   .ui-select-choices-row {
     > span {

dist/origin-web-common.css

@@ -470,6 +470,9 @@ div.hopscotch-bubble .hopscotch-nav-button.prev {
   text-decoration: none;
 }
 /* Fix some styles with the angular-ui-select bootstrap theme that isn't right when combined with all of our styles */
+body > .ui-select-bootstrap.open {
+  z-index: 1050;
+}
 .ui-select-bootstrap {
   /* Fixes ui-select's input box extending to 100% page width if the page has been resized after page-load
   * https://github.com/angular-ui/ui-select/issues/1678

src/styles/_ui-select.less

 /* Fix some styles with the angular-ui-select bootstrap theme that isn't right when combined with all of our styles */
+
+// ensure ui-select dropdown overlays when appended to body
+body > .ui-select-bootstrap.open {
+  z-index: @zindex-modal;
+}
 .ui-select-bootstrap {
   .ui-select-choices-row {
     > span {