scripts: Fix encoding errors for python3

Moved call of decode('utf-8') as close as possible to
call of subprocess API to avoid calling it in a lot of
other places.

Decoded binary data to utf-8 where appropriate to fix devtool
and recipetool tests in python 3 environment.

(From OE-Core rev: 30d02e2aa2d42fdf76271234b2dc9f37bc46b250)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/recipetool/create.py

@@ -851,14 +851,14 @@ def crunch_license(licfile):
                 continue
             # Squash spaces, and replace smart quotes, double quotes
             # and backticks with single quotes
-            line = oe.utils.squashspaces(line.strip()).decode("utf-8")
+            line = oe.utils.squashspaces(line.strip())
             line = line.replace(u"\u2018", "'").replace(u"\u2019", "'").replace(u"\u201c","'").replace(u"\u201d", "'").replace('"', '\'').replace('`', '\'')
             if line:
                 lictext.append(line)
 
     m = hashlib.md5()
     try:
-        m.update(' '.join(lictext))
+        m.update(' '.join(lictext).encode('utf-8'))
         md5val = m.hexdigest()
     except UnicodeEncodeError:
         md5val = None