fix live-iso serial console boot verification

This commit:
 - Changes the target string looked for via the serial logs by the ginkgo
 live-iso test code to verify that the live iso image has been booted
 properly.
 - Removes the redundant use of the "cat" command from the boot verification
 process in the live-iso test
 - Changes the name of the live-iso test image to the new image that is uefi
  compatible.

This change is needed because the release1.8 e2e feature test are failing the
live-iso boot verification even when the live-iso boot menu is visible in
the serial logs.

Signed-off-by: Adam Rozman <[email protected]>

scripts/ci-e2e.sh

@@ -67,7 +67,7 @@ source "${M3_DEV_ENV_PATH}/lib/ironic_basic_auth.sh"
 source "${M3_DEV_ENV_PATH}/lib/ironic_tls_setup.sh"
 
 # image for live iso testing
-export LIVE_ISO_IMAGE="https://artifactory.nordix.org/artifactory/metal3/images/iso/minimal_linux_live-v2.iso"
+export LIVE_ISO_IMAGE="https://artifactory.nordix.org/artifactory/metal3/images/iso/minimal_linux_live-v3-uefi.iso"
 
 # Generate credentials
 BMO_OVERLAYS=(

test/e2e/live_iso_test.go

@@ -92,7 +92,7 @@ func liveIsoTest() {
 
 		By("Reading serial logs to verify the node was booted from live ISO image")
 		Eventually(func(g Gomega) {
-			cmd := fmt.Sprintf("sudo cat %s | grep '#  Welcome'", serialLogFile)
+			cmd := fmt.Sprintf("sudo grep 'Minimal Linux Live' '%s'", serialLogFile)
 			output, err := exec.Command("/bin/sh", "-c", cmd).Output()
 			g.Expect(err).ToNot(HaveOccurred())
 			g.Expect(output).ToNot(BeNil(), fmt.Sprintf("Failed to read serial logs from %s", serialLogFile))