style(expect): normalize debugging messages

A minor style cleanup to the messages printed by the Expect scripts to
make them a bit more consistent and descriptive.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: Ibd8ccb4423bd5aaeffc99c2f3602123794dc6200
diff --git a/expect/tftf-sgi.exp b/expect/tftf-sgi.exp
index 63626e9..80390ee 100644
--- a/expect/tftf-sgi.exp
+++ b/expect/tftf-sgi.exp
@@ -8,20 +8,20 @@
 
 source [file join [file dirname [info script]] handle-arguments.inc]
 
-expect_string "Booting trusted firmware test framework" "Starting TFTF"
+expect_string "Booting trusted firmware test framework" "TFTF is booting"
 expect_re "Running at NS-EL(1|2)"
 
 expect {
 	"Tests Failed  : 0" {
-		expect_string "Exiting tests." "<<TFTF Success>>"
+		expect_string "Exiting tests." "all TFTF tests passed"
 		exit_uart 0
 	}
 	"Tests Passed  : 0" {
-		expect_string "Exiting tests." "<<TFTF no tests passed>>"
+		expect_string "Exiting tests." "no TFTF tests passed"
 		exit_uart -1
 	}
 	-re "Tests Failed  : \[^0]" {
-		expect_string "Exiting tests." "<<TFTF Fail>>"
+		expect_string "Exiting tests." "one or more TFTF tests failed"
 		exit_uart -1
 	}
 }