utils.py: added sh_quote() function

This function is a wrapper around "shlex.quote()" and can be used in
"${@...}" context where shlex (or pipes, which provides similar
functionality) is unavailable.

(From OE-Core rev: 127141f5023a7e3fc3963dc7d76cfce9067a9e8a)

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/utils.py

@@ -490,3 +490,6 @@ class ImageQAFailed(bb.build.FuncFailed):
 
         return msg
 
+def sh_quote(string):
+    import shlex
+    return shlex.quote(string)