tests: introduce create_client()

Introduce a new helper create_client(), which creates and initializes
the client struct, but does not create a wl_surface.

This will be useful for ivi-shell tests.

v2: Rebased, and restored the dependency to weston-test.so, since seat
handling requires it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Marek Chalupa <mchqwerty@gmail.com>
2 files changed