pTest-tcl fail fixed

pTest-tcl fail fixed

http.test httpold.test socket.test failed when run the pTest-tcl,because
the tcl script "info hostname" in /usr/lib/tcl/ptest/tests/http.test fail.
The file /etc/hosts didn't contain the map from hostname to 127.0.0.1, so
it need to add the map. In order to ensure the rootfs correct,add it at
build time, add the following command:
	"sed -i '1s/$/    ${MACHINE}/' ${WORKDIR}/hosts"
in do_install() function in the file meta/recipes-core/netbase/netbase_5.3.bb

Signed-off-by: Dengke Du <dengke.du@windriver.com>