oeqa/runtime/context.py: support listening port in TEST_SERVER_IP
Similar to the existing possibility to specify a port in
TEST_TARGET_IP, allow TEST_SERVER_IP to also contain a
port.
The intention is for this port to be passed into e.g.
the http server from the apt / dnf / opkg tests, or
any other (custom) tests that might need the target to
connect to a service spawned by bitbake / oeqa, where
bitbake is actually running inside a docker container.
Signed-off-by: André Draszik <git@andred.net> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
