valgrind: integration of regression tests to ptest

valgrind: integration of regression tests to ptest

Modifies valgrind's regression test framework to be compatible
with the yocto PTEST framework as follows:
 * existing recipe valgrind*bb adds new methods: do_compile_ptest and
   do_install_ptest.
 * new file run-ptest adds the wrapper interface to the valgrind
   regression test script vg_regtest.
 * existing valgrind regression test script 'vg_regtest' changes
   to report the status of the valgrind component tests in the
   format that PTEST expects, instead of the valgrind formats, but only
   when vg_regtest is invoked with an optional --yocto-ptest argument
 * four new patches disable building tests that don't compile with
   the yocto compiler and default options. See the patches for details.

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>