analyzer: eliminate region_model::on_ fns for sockets

analyzer: eliminate region_model::on_ fns for sockets

This mostly mechanical patch eliminates a confusing extra layer of
redundant calls in the handling of socket-related functions.

gcc/analyzer/ChangeLog:
	* region-model.h (region_model::on_socket): Delete decl.
	(region_model::on_bind): Likewise.
	(region_model::on_listen): Likewise.
	(region_model::on_accept): Likewise.
	(region_model::on_connect): Likewise.
	* sm-fd.cc (kf_socket::outcome_of_socket::update_model): Move body
	of region_model::on_socket into here, ...
	(region_model::on_socket): ...eliminating this function.
	(kf_bind::outcome_of_bind::update_model): Likewise for on_bind...
	(region_model::on_bind): ...eliminating this function.
	(kf_listen::outcome_of_listen::update_model): Likewise fo
	on_listen...
	(region_model::on_listen): ...eliminating this function.
	(kf_accept::outcome_of_accept::update_model): Likewise fo
	on_accept...
	(region_model::on_accept): ...eliminating this function.
	(kf_connect::outcome_of_connect::update_model): Likewise fo
	on_connect...
	(region_model::on_connect): ...eliminating this function.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>