bpftool: Add support for BPF_CGROUP_INET_SOCK_RELEASE

Support attaching to BPF_CGROUP_INET_SOCK_RELEASE and properly
display attach type upon prog dump.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200706230128.4073544-4-sdf@google.com

tools/bpf/bpftool/common.c

@@ -33,6 +33,7 @@ const char * const attach_type_name[__MAX_BPF_ATTACH_TYPE] = {
 	[BPF_CGROUP_INET_INGRESS]	= "ingress",
 	[BPF_CGROUP_INET_EGRESS]	= "egress",
 	[BPF_CGROUP_INET_SOCK_CREATE]	= "sock_create",
+	[BPF_CGROUP_INET_SOCK_RELEASE]	= "sock_release",
 	[BPF_CGROUP_SOCK_OPS]		= "sock_ops",
 	[BPF_CGROUP_DEVICE]		= "device",
 	[BPF_CGROUP_INET4_BIND]		= "bind4",