This is a mechanical change to
1. move test_sock_fields.c to prog_tests/sock_fields.c
2. rename progs/test_sock_fields_kern.c to progs/test_sock_fields.c
Minimal change is made to the code itself.  Next patch will make
changes to use new ways of writing test, e.g. use skel and global
variables.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200925000427.3857814-1-kafai@fb.com
 feature
 test_sock
 test_sock_addr
-test_sock_fields
 urandom_read
 test_sockmap
 test_lirc_mode2_user
 
        test_verifier_log test_dev_cgroup test_tcpbpf_user \
        test_sock test_sockmap get_cgroup_id_user test_socket_cookie \
        test_cgroup_storage \
-       test_netcnt test_tcpnotify_user test_sock_fields test_sysctl \
+       test_netcnt test_tcpnotify_user test_sysctl \
        test_progs-no_alu32 \
        test_current_pid_tgid_new_ns
 
 
        check_result();
 }
 
-int main(int argc, char **argv)
+void test_sock_fields(void)
 {
        struct bpf_prog_load_attr attr = {
-               .file = "test_sock_fields_kern.o",
+               .file = "test_sock_fields.o",
                .prog_type = BPF_PROG_TYPE_CGROUP_SKB,
                .prog_flags = BPF_F_TEST_RND_HI32,
        };
        cleanup_cgroup_environment();
 
        printf("PASS\n");
-
-       return 0;
 }