go.bbclass: separate the ptest logic to go-ptest class
The current go class includes ptest logic by default
and will make the recipe which inherits go class
to support ptest automatically though maybe the
recipe which inherits go class doesn't plan to
support the ptest.
So separate the ptest logic to another specified
class go-ptest to make the recipe which needs to
inherit go class more flexible with regards to
ptest support.
Signed-off-by: Mingli Yu <mingli.yu@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
