lib/oe/terminal.py: decode bytes variable before rstrip/split

On python 3, bytes variable types must be decoded if these are intended to be
used as strings, otherwise we get the following error exception:

    TypeError: Type str doesn't support the buffer API

(From OE-Core rev: b950539c911b7945d652b05616164828e711ac7f)

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/terminal.py

@@ -246,7 +246,7 @@ def check_terminal_version(terminalName):
         newenv["LANG"] = "C"
         p = sub.Popen(['sh', '-c', cmdversion], stdout=sub.PIPE, stderr=sub.PIPE, env=newenv)
         out, err = p.communicate()
-        ver_info = out.rstrip().split('\n')
+        ver_info = out.decode().rstrip().split('\n')
     except OSError as exc:
         import errno
         if exc.errno == errno.ENOENT: