[test] enhance parsing addresses (#6045)

Expect sometimes matches the pattern before a line is fully printed to
TTY. As a result, the address returned may not be accurate. This commit
fixes this issue by matching line breaks.

tests/scripts/expect/cli-coex.exp

@@ -32,15 +32,15 @@ source "tests/scripts/expect/_common.exp"
 spawn_node 1
 
 send "coex disable\n"
-expect "Done"
+expect_line "Done"
 send "coex\n"
 expect "Disabled"
-expect "Done"
+expect_line "Done"
 send "coex enable\n"
-expect "Done"
+expect_line "Done"
 send "coex\n"
 expect "Enabled"
-expect "Done"
+expect_line "Done"
 send "coex metrics\n"
 expect -re {Stopped: (true|false)}
 expect -re {Grant Glitch: \d+}
@@ -63,7 +63,7 @@ expect -re {    Grant Deactivated During Request: \d+}
 expect -re {    Delayed Grant: \d+}
 expect -re {    Average Request To Grant Time: \d+}
 expect -re {    Grant None: \d+}
-expect "Done"
+expect_line "Done"
 send "coex something_invalid\n"
 expect "Error 7: InvalidArgs"