Using sys.executable ensures we're using the same python binary for the server
as the client, which is probably advisable. "bitbake-server" is left as the process
name as its more distinctive in process listings.
(Bitbake rev: 387a339b330e8122a62a148249beb3f064dd4e3d)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>