Move the pysh package into the bb package

The pysh we're using is modified, and we don't want to risk it conflicting
with one from elsewhere.

(Bitbake rev: 1cbf8a9403b4b60d59bfd90a51c3e4246ab834d6)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/codeparser.py

@@ -1,4 +1,4 @@
-from pysh import pyshyacc, pyshlex
+from bb.pysh import pyshyacc, pyshlex
 from itertools import chain
 from bb import msg, utils
 import ast