use lowercase $VERSION for upgrade version check

Summary:
For Rawhide, the text in os-release-fedora is 'rawhide' not
'Rawhide', so lc the $VERSION value when checking. For other
releases it's digits, so the lc won't change anything - lc('23')
is '23'.

Test Plan: Run the Rawhide upgrade tests, they should succeed.

Reviewers: jskladan, garretraziel

Reviewed By: garretraziel

Subscribers: tflink

Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D620

tests/upgrade_postinstall_desktop.pm

@@ -19,7 +19,7 @@ sub run {
     assert_screen "graphical_desktop_clean", 30;
     # check an upgrade actually happened (and we can log into a console)
     $self->root_console(tty=>3);
-    $self->check_release(get_var('VERSION'));
+    $self->check_release(lc(get_var('VERSION')));
 }
 
 

tests/upgrade_postinstall_minimal.pm

@@ -9,7 +9,7 @@ sub run {
     # try to login, check whether target release is installed
     $self->boot_to_login_screen();
     $self->root_console(tty=>3);
-    $self->check_release(get_var('VERSION'));
+    $self->check_release(lc(get_var('VERSION')));
 }