oeqa/utils/qemurunner: search for login string in the entire boot log

If some service is to spammy we might miss the login, so search
in the entire log instead of just the last few lines.
Use qemu in regex too (to avoid a login string from some service).

(From OE-Core rev: 1117d25fdfabbf1afdc7030e05efc6a32df871e3)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/qemurunner.py

@@ -133,8 +133,7 @@ class QemuRunner:
                         if data:
                             self.log(data)
                             self.bootlog += data
-                            lastlines = "\n".join(self.bootlog.splitlines()[-2:])
-                            if re.search("login:", lastlines):
+                            if re.search("qemu.* login:", self.bootlog):
                                 stopread = True
                                 reachedlogin = True
                                 bb.note("Reached login banner")