Remove agentx and control socket support.

snmpctl has been removed two releases ago, which makes the control
interface obsolete.

agentx support has always been quirky at best, but got completely broken
with the BER_MAX_OID_LEN increase in ber.h. This change resulted in the
oid length on the snmp side being left uninitialized because of size
difference, resulting in weird behaviour. No one reported the breakage,
even after 6.7 was released.

This change requires users to remove the socket keyword from their
snmpd.conf.

OK denis@

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