Click on language select screen (RHBZ #1566066)

We've been seeing an odd case lately where the language select
screen is not foregrounded when it appears (so all text is
grey). It happens very occasionally on x86_64, but a lot on
ppc64. To work around this, let's add a needle that matches the
inactive screen, and click on the screen when it appears just
to make sure it's active.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/anaconda/lang_select/install_lang_inactive-20180425.json

@@ -0,0 +1,16 @@
+{
+  "properties": [],
+  "area": [
+    {
+      "width": 84,
+      "type": "match",
+      "ypos": 103,
+      "xpos": 357,
+      "height": 28
+    }
+  ],
+  "tags": [
+    "ENV-DISTRI-fedora",
+    "anaconda_select_install_lang",
+  ]
+}

tests/_boot_to_anaconda.pm

@@ -50,8 +50,9 @@ sub run {
                 assert_and_click "live_start_anaconda_icon", '', 300;
             }
             my $language = get_var('LANGUAGE') || 'english';
-            # wait for anaconda to appear
-            assert_screen "anaconda_select_install_lang", 300;
+            # wait for anaconda to appear; we click to work around
+            # RHBZ #1566066 if it happens
+            assert_and_click "anaconda_select_install_lang", '', 300;
             # Select install language
             wait_screen_change { assert_and_click "anaconda_select_install_lang_input"; };
             type_safely $language;