Make log upload work when installed system hits emergency mode

Summary:
This is to handle cases like #1414904 , where the system boots
to emergency mode. We really need logs to try and debug this.

Test Plan:
Force a test to hit emergency mode somehow (right now
you can just run base_services_start on Rawhide over and over
until you hit #1414904, but there's probably an easier way to
do it, I think there's a systemd boot arg to tell it which target
to boot for e.g.) and check logs get uploaded. Also check this
doesn't break log upload for a 'normal' failure.

Reviewers: garretraziel_but_actually_jsedlak_who_uses_stupid_nicknames

Reviewed By: garretraziel_but_actually_jsedlak_who_uses_stupid_nicknames

Subscribers: tflink

Differential Revision: https://phab.qa.fedoraproject.org/D1103

lib/installedtest.pm

@@ -23,10 +23,21 @@ sub root_console {
 sub post_fail_hook {
     my $self = shift;
 
+    if (check_screen 'emergency_rescue', 3) {
+        my $password = get_var("ROOT_PASSWORD", "weakpassword");
+        type_string "$password\n";
+        # bring up network so we can upload logs
+        assert_script_run "dhclient";
+    }
+    else {
         $self->root_console(tty=>6);
+    }
 
-    # We can't rely on tar being in minimal installs
-    assert_script_run "dnf -y install tar", 180;
+    # We can't rely on tar being in minimal installs, but we also can't
+    # rely on dnf always working (it fails in emergency mode, not sure
+    # why), so try it, then check if we have tar
+    script_run "dnf -y install tar", 180;
+    assert_script_run "rpm -q tar";
 
     # Note: script_run returns the exit code, so the logic looks weird.
     # We're testing that the directory exists and contains something.

needles/console/emergency_rescue-20170119.json

@@ -0,0 +1,16 @@
+{
+  "properties": [],
+  "tags": [
+    "LANGUAGE-english",
+    "emergency_rescue"
+  ],
+  "area": [
+    {
+      "xpos": 1,
+      "ypos": 48,
+      "width": 142,
+      "height": 16,
+      "type": "match"
+    }
+  ]
+}

tests/_console_wait_login.pm

@@ -1,4 +1,4 @@
-use base "basetest";
+use base "installedtest";
 use strict;
 use testapi;
 use utils;