Add a new distro feature "ptest".

This patch creates a new distro feature "ptest", which creates -ptest
packages containing the test suite of the package for running on the
target. Test files are installed in /usr/lib/<pkg>/ptest.

The patch also includes a change to automake, splitting the "make check"
target into separate steps for building and running the tests.

(From OE-Core rev: 6f92e7f8891008dd3c89325d3fbe2da853372326)

Signed-off-by: Björn Stenberg <bjst@enea.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/packagegroup.bbclass

@@ -25,7 +25,7 @@ python () {
     packages = d.getVar('PACKAGES', True).split()
     genpackages = []
     for pkg in packages:
-        for postfix in ['-dbg', '-dev']:
+        for postfix in ['-dbg', '-dev', '-ptest']:
             genpackages.append(pkg+postfix)
     d.setVar('PACKAGES', ' '.join(packages+genpackages))
 }