insane: don't use cachedpath

Unless cachedpath is used correctly then it's just a glorified clone of
os.walk, but without any of the recent optimisations in os.walk.  In
this codepath there is no point to using cachedpath.

(From OE-Core rev: 460222c54e4c65352c0687f2b6c70527cc9a2b4b)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/insane.bbclass

@@ -937,14 +937,13 @@ python do_package_qa () {
     pkgdest = d.getVar('PKGDEST')
     packages = set((d.getVar('PACKAGES') or '').split())
 
-    cpath = oe.cachedpath.CachedPath()
     global pkgfiles
     pkgfiles = {}
     for pkg in packages:
         pkgfiles[pkg] = []
-        for walkroot, dirs, files in cpath.walk(pkgdest + "/" + pkg):
+        for walkroot, dirs, files in os.walk(os.path.join(pkgdest, pkg)):
             for file in files:
-                pkgfiles[pkg].append(walkroot + os.sep + file)
+                pkgfiles[pkg].append(os.path.join(walkroot, file))
 
     # no packages should be scanned
     if not packages: