Merge branch 'sctp-support-per-endpoint-auth-and-asconf-flags'

Xin Long says:

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sctp: support per endpoint auth and asconf flags

This patchset mostly does 3 things:

  1. add per endpint asconf flag and use asconf flag properly
     and add SCTP_ASCONF_SUPPORTED sockopt.
  2. use auth flag properly and add SCTP_AUTH_SUPPORTED sockopt.
  3. remove the 'global feature switch' to discard chunks.
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Signed-off-by: David S. Miller <davem@davemloft.net>