The function 'snmp:print_version_info/0' which prints
various (version) info, attempted to extract the
"compile time" of each module in the snmp app.
This info used to be availabe in the module_info of
each module, but has been removed (a "long" time ago).
This resulted in a pointless "Not Found" beeing printed.
This has now been removed from the into printed.

OTP-15330

Changes to satisfy dialyzer. Including changing the definition
of the snmpm_network_interface behaviour (use the '-callback'
attribute instead of an explicit behaviour_info/1 function).

OTP-15932

Make target (for running dialyzer on snmp), os usage
and a minor snmp_log ("future proofing").

OTP-15932

Use of the deprecated module random has been replaced
by the module rand.

OTP-15331

Removed the use of the deprecated erlang:stacktrace() function.
Instead make use of the 'catch Class:Error:Stacktrace' feature.

OTP-15332

Added the snmpa_get module as the default get-mechanism
for the agent.
This has been done by simply moving the do_get, do_get_next
and do_get_bulk functions from the snmpa_agent module.
Some functions where also moved into the lib module (with
the idea of beeing more generally useful).

OTP-15691

Add/update and export some useful types.

OTP-15691