Merge branch 'bareudp-several-code-cleanup-for-bareudp-module'

Taehee Yoo says:

====================
bareudp: several code cleanup for bareudp module

This patchset is to cleanup bareudp module code.

1. The first patch is to add module alias
In the current bareudp code, there is no module alias.
So, RTNL couldn't load bareudp module automatically.

2. The second patch is to add extack message.
The extack error message is useful for noticing specific errors
when command is failed.

3. The third patch is to remove unnecessary udp_encap_enable().
In the bareudp_socket_create(), udp_encap_enable() is called.
But, the it's already called in the setup_udp_tunnel_sock().
So, it could be removed.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>