nhrpd: add cisco-authentication password support

Taking over this development from https://github.com/FRRouting/frr/pull/14788

This commit addresses 4 issues found in the previous PR

1) FRR would accept messages from a spoke without authentication when FRR NHRP had auth configured.
2) The error indication was not being sent in network byte order
3) The debug print in nhrp_connection_authorized was not correctly printing the received password
4) The addresses portion of the mandatory part of the error indication was invalid on the wire (confirmed in wireshark)

Signed-off-by: Dave LeRoy <dleroy@labn.net>
Co-authored-by: Volodymyr Huti <volodymyr.huti@gmail.com>

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