oeqa/ssh: Avoid unicode decode exceptions

This code really needs to be rewritten to not split potential
multibyte characters, for now work around it to avoid exceptions like:

  File "/home/pokybuild/yocto-worker/qa-extras2/build/meta/lib/oeqa/core/target/ssh.py", line 211, in run
    data = reader.read(1024, 4096)
  File "/usr/lib64/python3.6/codecs.py", line 503, in read
    newchars, decodedbytes = self.decode(data, self.errors)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x92 in position 0: invalid start byte

(From OE-Core rev: 17e87510378f2729208a8262695f28e1efe5eb4c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/target/ssh.py

@@ -207,7 +207,7 @@ def SSHCall(command, logger, timeout=None, **opts):
                 logger.debug('time: %s, endtime: %s' % (time.time(), endtime))
                 try:
                     if select.select([process.stdout], [], [], 5)[0] != []:
-                        reader = codecs.getreader('utf-8')(process.stdout)
+                        reader = codecs.getreader('utf-8')(process.stdout, 'surrogatepass')
                         data = reader.read(1024, 4096)
                         if not data:
                             process.stdout.close()
@@ -234,7 +234,7 @@ def SSHCall(command, logger, timeout=None, **opts):
                 output += lastline
 
         else:
-            output = process.communicate()[0].decode("utf-8", errors='replace')
+            output = process.communicate()[0].decode("utf-8", errors='surrogatepass')
             logger.debug('Data from SSH call: %s' % output.rstrip())
 
     options = {