lib: Move default test OS to Fedora 39

Adjust the naughty, as our test output sometimes includes Uncaught (in
promise) and sometimes not.

lib/constants.py

@@ -36,5 +36,5 @@
 DEFAULT_IDENTITY_FILE = os.path.join(MACHINE_DIR, "identity")
 DEFAULT_IDENTITY_PUB_FILE = os.path.join(MACHINE_DIR, "identity.pub")
 
-TEST_OS_DEFAULT = "fedora-38"
+TEST_OS_DEFAULT = "fedora-39"
 DEFAULT_IMAGE = os.environ.get("TEST_OS", TEST_OS_DEFAULT)

naughty/fedora-39/5106-journalctl-since-until-behaviour-change

@@ -2,4 +2,4 @@ Traceback (most recent call last):
   File "*", line *, in testEvents
 *
 testlib.Error: timeout
-wait_js_cond(ph_is_present(".cockpit-log-message:contains('Created slice cockpittest.slice.')")): Uncaught (in promise) Error: condition did not become true
+wait_js_cond(ph_is_present(".cockpit-log-message:contains('Created slice cockpittest.slice.')")):* condition did not become true

naughty/fedora-39/5106-journalctl-since-until-behaviour-change-2

@@ -1,4 +1,4 @@
 Traceback (most recent call last):
   File "*", line *, in testRebootAndTime
 *
-        })(["January 1, 2037", ["check-journal", "AFTER BOOT", ""], ["", "Reboot", ""], ["check-journal", "BEFORE BOOT", ""]])): Uncaught (in promise) Error: condition did not become true
+        })(["January 1, 2037", ["check-journal", "AFTER BOOT", ""], ["", "Reboot", ""], ["check-journal", "BEFORE BOOT", ""]])):* condition did not become true